diff --git a/frozen/Adafruit_CircuitPython_BusDevice b/frozen/Adafruit_CircuitPython_BusDevice
index 182eebdc81..b9280af514 160000
--- a/frozen/Adafruit_CircuitPython_BusDevice
+++ b/frozen/Adafruit_CircuitPython_BusDevice
@@ -1 +1 @@
-Subproject commit 182eebdc8168e3d14cd0cb28db3abb734c9e45f3
+Subproject commit b9280af5142fc41639229544678e23b5cca07c3a
diff --git a/frozen/Adafruit_CircuitPython_CircuitPlayground b/frozen/Adafruit_CircuitPython_CircuitPlayground
index 0cc2e975ed..154b74de02 160000
--- a/frozen/Adafruit_CircuitPython_CircuitPlayground
+++ b/frozen/Adafruit_CircuitPython_CircuitPlayground
@@ -1 +1 @@
-Subproject commit 0cc2e975ed22ace0d679c6fb8f3388034b88bcf1
+Subproject commit 154b74de020764597ba49f0d1e8cc18d55b3643b
diff --git a/frozen/Adafruit_CircuitPython_LIS3DH b/frozen/Adafruit_CircuitPython_LIS3DH
index f5892e24f7..bd7ddc67dc 160000
--- a/frozen/Adafruit_CircuitPython_LIS3DH
+++ b/frozen/Adafruit_CircuitPython_LIS3DH
@@ -1 +1 @@
-Subproject commit f5892e24f7235c4bde2908cbb3cd0a3d6b34d421
+Subproject commit bd7ddc67dc86f7ad0115f58ab80d5605739c6482
diff --git a/frozen/Adafruit_CircuitPython_Motor b/frozen/Adafruit_CircuitPython_Motor
index 5a50830814..ddc7484498 160000
--- a/frozen/Adafruit_CircuitPython_Motor
+++ b/frozen/Adafruit_CircuitPython_Motor
@@ -1 +1 @@
-Subproject commit 5a50830814aaeeb1fda34ed0ba2f8397415d9796
+Subproject commit ddc74844983b35b027bd45091c7b8bb3c8d7a2d1
diff --git a/frozen/Adafruit_CircuitPython_seesaw b/frozen/Adafruit_CircuitPython_seesaw
index 4b101f0032..f1171f9408 160000
--- a/frozen/Adafruit_CircuitPython_seesaw
+++ b/frozen/Adafruit_CircuitPython_seesaw
@@ -1 +1 @@
-Subproject commit 4b101f00320d36b23f8cc28cf3f12127085894c1
+Subproject commit f1171f94083ba64d153ff3f90eeb07500331d6e1
diff --git a/frozen/circuitpython-stage b/frozen/circuitpython-stage
index 397badae58..6d1ae72916 160000
--- a/frozen/circuitpython-stage
+++ b/frozen/circuitpython-stage
@@ -1 +1 @@
-Subproject commit 397badae5863a1ce932213ef527e82314ac498a1
+Subproject commit 6d1ae72916cf240ea86185c45f844d59f56d8ec3
diff --git a/locale/ID.po b/locale/ID.po
index f5c0c09495..60d882bc60 100644
--- a/locale/ID.po
+++ b/locale/ID.po
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2019-05-13 17:34-0700\n"
+"POT-Creation-Date: 2019-06-25 17:53-0700\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -460,6 +460,14 @@ msgstr ""
 msgid "Command must be an int between 0 and 255"
 msgstr ""
 
+#: py/persistentcode.c
+msgid "Corrupt .mpy file"
+msgstr ""
+
+#: py/emitglue.c
+msgid "Corrupt raw code"
+msgstr ""
+
 #: ports/nrf/common-hal/bleio/UUID.c
 #, c-format
 msgid "Could not decode ble_uuid, err 0x%04x"
diff --git a/locale/circuitpython.pot b/locale/circuitpython.pot
index 34070dc69b..1c48658ec7 100644
--- a/locale/circuitpython.pot
+++ b/locale/circuitpython.pot
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2019-05-13 17:41-0700\n"
+"POT-Creation-Date: 2019-06-25 17:53-0700\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -450,6 +450,14 @@ msgstr ""
 msgid "Command must be an int between 0 and 255"
 msgstr ""
 
+#: py/persistentcode.c
+msgid "Corrupt .mpy file"
+msgstr ""
+
+#: py/emitglue.c
+msgid "Corrupt raw code"
+msgstr ""
+
 #: ports/nrf/common-hal/bleio/UUID.c
 #, c-format
 msgid "Could not decode ble_uuid, err 0x%04x"
diff --git a/locale/de_DE.po b/locale/de_DE.po
index 2cb97c3d31..2b3b25ce7c 100644
--- a/locale/de_DE.po
+++ b/locale/de_DE.po
@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: \n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2019-05-13 17:34-0700\n"
+"POT-Creation-Date: 2019-06-25 17:53-0700\n"
 "PO-Revision-Date: 2018-07-27 11:55-0700\n"
 "Last-Translator: Pascal Deneaux\n"
 "Language-Team: Sebastian Plamauer, Pascal Deneaux\n"
@@ -454,6 +454,14 @@ msgstr ""
 msgid "Command must be an int between 0 and 255"
 msgstr "Der Befehl muss ein int zwischen 0 und 255 sein"
 
+#: py/persistentcode.c
+msgid "Corrupt .mpy file"
+msgstr ""
+
+#: py/emitglue.c
+msgid "Corrupt raw code"
+msgstr ""
+
 #: ports/nrf/common-hal/bleio/UUID.c
 #, c-format
 msgid "Could not decode ble_uuid, err 0x%04x"
diff --git a/locale/en_US.po b/locale/en_US.po
index ebc18cfaee..1b5c360109 100644
--- a/locale/en_US.po
+++ b/locale/en_US.po
@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: \n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2019-05-13 17:34-0700\n"
+"POT-Creation-Date: 2019-06-25 17:53-0700\n"
 "PO-Revision-Date: 2018-07-27 11:55-0700\n"
 "Last-Translator: \n"
 "Language-Team: \n"
@@ -450,6 +450,14 @@ msgstr ""
 msgid "Command must be an int between 0 and 255"
 msgstr ""
 
+#: py/persistentcode.c
+msgid "Corrupt .mpy file"
+msgstr ""
+
+#: py/emitglue.c
+msgid "Corrupt raw code"
+msgstr ""
+
 #: ports/nrf/common-hal/bleio/UUID.c
 #, c-format
 msgid "Could not decode ble_uuid, err 0x%04x"
diff --git a/locale/en_x_pirate.po b/locale/en_x_pirate.po
index 04706abdcd..12a134a7dc 100644
--- a/locale/en_x_pirate.po
+++ b/locale/en_x_pirate.po
@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: \n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2019-05-13 17:34-0700\n"
+"POT-Creation-Date: 2019-06-25 17:53-0700\n"
 "PO-Revision-Date: 2018-07-27 11:55-0700\n"
 "Last-Translator: \n"
 "Language-Team: @sommersoft, @MrCertainly\n"
@@ -454,6 +454,14 @@ msgstr ""
 msgid "Command must be an int between 0 and 255"
 msgstr ""
 
+#: py/persistentcode.c
+msgid "Corrupt .mpy file"
+msgstr ""
+
+#: py/emitglue.c
+msgid "Corrupt raw code"
+msgstr ""
+
 #: ports/nrf/common-hal/bleio/UUID.c
 #, c-format
 msgid "Could not decode ble_uuid, err 0x%04x"
diff --git a/locale/es.po b/locale/es.po
index 77739f49cb..63dae87de0 100644
--- a/locale/es.po
+++ b/locale/es.po
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: \n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2019-05-13 17:34-0700\n"
+"POT-Creation-Date: 2019-06-25 17:53-0700\n"
 "PO-Revision-Date: 2018-08-24 22:56-0500\n"
 "Last-Translator: \n"
 "Language-Team: \n"
@@ -466,6 +466,14 @@ msgstr "La entrada en la columna debe ser digitalio.DigitalInOut"
 msgid "Command must be an int between 0 and 255"
 msgstr "Bytes debe estar entre 0 y 255."
 
+#: py/persistentcode.c
+msgid "Corrupt .mpy file"
+msgstr ""
+
+#: py/emitglue.c
+msgid "Corrupt raw code"
+msgstr ""
+
 #: ports/nrf/common-hal/bleio/UUID.c
 #, c-format
 msgid "Could not decode ble_uuid, err 0x%04x"
diff --git a/locale/fil.po b/locale/fil.po
index 5954e29b49..393c67ad13 100644
--- a/locale/fil.po
+++ b/locale/fil.po
@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: \n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2019-05-13 17:34-0700\n"
+"POT-Creation-Date: 2019-06-25 17:53-0700\n"
 "PO-Revision-Date: 2018-12-20 22:15-0800\n"
 "Last-Translator: Timothy <me@timothygarcia.ca>\n"
 "Language-Team: fil\n"
@@ -459,6 +459,14 @@ msgstr ""
 msgid "Command must be an int between 0 and 255"
 msgstr "Sa gitna ng 0 o 255 dapat ang bytes."
 
+#: py/persistentcode.c
+msgid "Corrupt .mpy file"
+msgstr ""
+
+#: py/emitglue.c
+msgid "Corrupt raw code"
+msgstr ""
+
 #: ports/nrf/common-hal/bleio/UUID.c
 #, c-format
 msgid "Could not decode ble_uuid, err 0x%04x"
diff --git a/locale/fr.po b/locale/fr.po
index 0bd0f8771e..a64deeace7 100644
--- a/locale/fr.po
+++ b/locale/fr.po
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: 0.1\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2019-05-13 17:34-0700\n"
+"POT-Creation-Date: 2019-06-25 17:53-0700\n"
 "PO-Revision-Date: 2019-04-14 20:05+0100\n"
 "Last-Translator: Pierrick Couturier <arofarn@arofarn.info>\n"
 "Language-Team: fr\n"
@@ -465,6 +465,14 @@ msgstr "L'entrée 'Column' doit être un digitalio.DigitalInOut"
 msgid "Command must be an int between 0 and 255"
 msgstr "La commande doit être un entier entre 0 et 255"
 
+#: py/persistentcode.c
+msgid "Corrupt .mpy file"
+msgstr ""
+
+#: py/emitglue.c
+msgid "Corrupt raw code"
+msgstr ""
+
 #: ports/nrf/common-hal/bleio/UUID.c
 #, c-format
 msgid "Could not decode ble_uuid, err 0x%04x"
diff --git a/locale/it_IT.po b/locale/it_IT.po
index 12f21c38ea..52c229e030 100644
--- a/locale/it_IT.po
+++ b/locale/it_IT.po
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2019-05-13 17:34-0700\n"
+"POT-Creation-Date: 2019-06-25 17:53-0700\n"
 "PO-Revision-Date: 2018-10-02 16:27+0200\n"
 "Last-Translator: Enrico Paganin <enrico.paganin@mail.com>\n"
 "Language-Team: \n"
@@ -460,6 +460,14 @@ msgstr ""
 msgid "Command must be an int between 0 and 255"
 msgstr "I byte devono essere compresi tra 0 e 255"
 
+#: py/persistentcode.c
+msgid "Corrupt .mpy file"
+msgstr ""
+
+#: py/emitglue.c
+msgid "Corrupt raw code"
+msgstr ""
+
 #: ports/nrf/common-hal/bleio/UUID.c
 #, c-format
 msgid "Could not decode ble_uuid, err 0x%04x"
diff --git a/locale/pl.po b/locale/pl.po
index 1a7471f728..bdb6f47958 100644
--- a/locale/pl.po
+++ b/locale/pl.po
@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: \n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2019-05-13 17:34-0700\n"
+"POT-Creation-Date: 2019-06-25 17:53-0700\n"
 "PO-Revision-Date: 2019-03-19 18:37-0700\n"
 "Last-Translator: Radomir Dopieralski <circuitpython@sheep.art.pl>\n"
 "Language-Team: pl\n"
@@ -453,6 +453,14 @@ msgstr "Kolumny muszą być typu digitalio.DigitalInOut"
 msgid "Command must be an int between 0 and 255"
 msgstr "Komenda musi być int pomiędzy 0 a 255"
 
+#: py/persistentcode.c
+msgid "Corrupt .mpy file"
+msgstr ""
+
+#: py/emitglue.c
+msgid "Corrupt raw code"
+msgstr ""
+
 #: ports/nrf/common-hal/bleio/UUID.c
 #, c-format
 msgid "Could not decode ble_uuid, err 0x%04x"
diff --git a/locale/pt_BR.po b/locale/pt_BR.po
index 390610041e..8b61c23b81 100644
--- a/locale/pt_BR.po
+++ b/locale/pt_BR.po
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2019-05-13 17:34-0700\n"
+"POT-Creation-Date: 2019-06-25 17:53-0700\n"
 "PO-Revision-Date: 2018-10-02 21:14-0000\n"
 "Last-Translator: \n"
 "Language-Team: \n"
@@ -456,6 +456,14 @@ msgstr ""
 msgid "Command must be an int between 0 and 255"
 msgstr "Os bytes devem estar entre 0 e 255."
 
+#: py/persistentcode.c
+msgid "Corrupt .mpy file"
+msgstr ""
+
+#: py/emitglue.c
+msgid "Corrupt raw code"
+msgstr ""
+
 #: ports/nrf/common-hal/bleio/UUID.c
 #, c-format
 msgid "Could not decode ble_uuid, err 0x%04x"
diff --git a/locale/zh_Latn_pinyin.po b/locale/zh_Latn_pinyin.po
index 82264cb526..314591560a 100644
--- a/locale/zh_Latn_pinyin.po
+++ b/locale/zh_Latn_pinyin.po
@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: circuitpython-cn\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2019-05-13 17:34-0700\n"
+"POT-Creation-Date: 2019-06-25 17:53-0700\n"
 "PO-Revision-Date: 2019-04-13 10:10-0700\n"
 "Last-Translator: hexthat\n"
 "Language-Team: Chinese Hanyu Pinyin\n"
@@ -454,6 +454,14 @@ msgstr "Liè tiáomù bìxū shì digitalio.DigitalInOut"
 msgid "Command must be an int between 0 and 255"
 msgstr "Mìnglìng bìxū shì 0 dào 255 zhī jiān de int"
 
+#: py/persistentcode.c
+msgid "Corrupt .mpy file"
+msgstr ""
+
+#: py/emitglue.c
+msgid "Corrupt raw code"
+msgstr ""
+
 #: ports/nrf/common-hal/bleio/UUID.c
 #, c-format
 msgid "Could not decode ble_uuid, err 0x%04x"
diff --git a/ports/atmel-samd/boards/pirkey_m0/pins.c b/ports/atmel-samd/boards/pirkey_m0/pins.c
index e1f43c83cc..41d02e3291 100644
--- a/ports/atmel-samd/boards/pirkey_m0/pins.c
+++ b/ports/atmel-samd/boards/pirkey_m0/pins.c
@@ -5,8 +5,5 @@ STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
 
     { MP_ROM_QSTR(MP_QSTR_APA102_MOSI), MP_ROM_PTR(&pin_PA00) },
     { MP_ROM_QSTR(MP_QSTR_APA102_SCK),  MP_ROM_PTR(&pin_PA01) },
-    { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
-    { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
-    { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
 };
 MP_DEFINE_CONST_DICT(board_module_globals, board_global_dict_table);
diff --git a/py/emitglue.c b/py/emitglue.c
index 74bf8ddca2..7708689dd4 100644
--- a/py/emitglue.c
+++ b/py/emitglue.c
@@ -142,11 +142,12 @@ mp_obj_t mp_make_function_from_raw_code(const mp_raw_code_t *rc, mp_obj_t def_ar
             fun = mp_obj_new_fun_asm(rc->n_pos_args, rc->data.u_native.fun_data, rc->data.u_native.type_sig);
             break;
         #endif
-        default:
-            // rc->kind should always be set and BYTECODE is the only remaining case
-            assert(rc->kind == MP_CODE_BYTECODE);
+        case MP_CODE_BYTECODE:
             fun = mp_obj_new_fun_bc(def_args, def_kw_args, rc->data.u_byte.bytecode, rc->data.u_byte.const_table);
             break;
+        default:
+            // All other kinds are invalid.
+            mp_raise_RuntimeError(translate("Corrupt raw code"));
     }
 
     // check for generator functions and if so wrap in generator object
diff --git a/py/persistentcode.c b/py/persistentcode.c
index f6de782ed8..eb69bd4079 100644
--- a/py/persistentcode.c
+++ b/py/persistentcode.c
@@ -102,20 +102,35 @@ STATIC void extract_prelude(const byte **ip, const byte **ip2, bytecode_prelude_
 
 #include "py/parsenum.h"
 
+STATIC void raise_corrupt_mpy(void) {
+    mp_raise_RuntimeError(translate("Corrupt .mpy file"));
+}
+
 STATIC int read_byte(mp_reader_t *reader) {
-    return reader->readbyte(reader->data);
+    mp_uint_t b = reader->readbyte(reader->data);
+    if (b == MP_READER_EOF) {
+        raise_corrupt_mpy();
+    }
+    return b;
 }
 
 STATIC void read_bytes(mp_reader_t *reader, byte *buf, size_t len) {
     while (len-- > 0) {
-        *buf++ = reader->readbyte(reader->data);
+        mp_uint_t b =reader->readbyte(reader->data);
+        if (b == MP_READER_EOF) {
+            raise_corrupt_mpy();
+        }
+        *buf++ = b;
     }
 }
 
 STATIC size_t read_uint(mp_reader_t *reader) {
     size_t unum = 0;
     for (;;) {
-        byte b = reader->readbyte(reader->data);
+        mp_uint_t b = reader->readbyte(reader->data);
+        if (b == MP_READER_EOF) {
+            raise_corrupt_mpy();
+        }
         unum = (unum << 7) | (b & 0x7f);
         if ((b & 0x80) == 0) {
             break;
@@ -145,11 +160,12 @@ STATIC mp_obj_t load_obj(mp_reader_t *reader) {
             return mp_obj_new_str_from_vstr(obj_type == 's' ? &mp_type_str : &mp_type_bytes, &vstr);
         } else if (obj_type == 'i') {
             return mp_parse_num_integer(vstr.buf, vstr.len, 10, NULL);
-        } else {
-            assert(obj_type == 'f' || obj_type == 'c');
+        } else if (obj_type == 'f' || obj_type == 'c') {
             return mp_parse_num_decimal(vstr.buf, vstr.len, obj_type == 'c', false, NULL);
         }
     }
+    raise_corrupt_mpy();
+    return MP_OBJ_FROM_PTR(&mp_const_none_obj);
 }
 
 STATIC void load_bytecode_qstrs(mp_reader_t *reader, byte *ip, byte *ip_top) {
diff --git a/tests/import/mpy_invalid.py b/tests/import/mpy_invalid.py
index 6a4e116e78..b9dd99a440 100644
--- a/tests/import/mpy_invalid.py
+++ b/tests/import/mpy_invalid.py
@@ -59,8 +59,8 @@ for i in range(len(user_files)):
     mod = 'mod%u' % i
     try:
         __import__(mod)
-    except ValueError as er:
-        print(mod, 'ValueError', er)
+    except Exception as e:
+        print(mod, type(e).__name__, e)
 
 # unmount and undo path addition
 uos.umount('/userfs')
diff --git a/tests/import/mpy_invalid.py.exp b/tests/import/mpy_invalid.py.exp
index e4f2b13e99..197eb4f7b2 100644
--- a/tests/import/mpy_invalid.py.exp
+++ b/tests/import/mpy_invalid.py.exp
@@ -1,3 +1,3 @@
-mod0 ValueError Incompatible .mpy file. Please update all .mpy files. See http://adafru.it/mpy-update for more info.
-mod1 ValueError Incompatible .mpy file. Please update all .mpy files. See http://adafru.it/mpy-update for more info.
-mod2 ValueError Incompatible .mpy file. Please update all .mpy files. See http://adafru.it/mpy-update for more info.
+mod0 RuntimeError Corrupt .mpy file
+mod1 RuntimeError Corrupt .mpy file
+mod2 MpyError Incompatible .mpy file. Please update all .mpy files. See http://adafru.it/mpy-update for more info.