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Damn, sorry. I saw too late, that there is a post already... http://forum.espruino.com/conversations/337530/

Hey guys, thanks a lot for supporting Espruino on the ESP32, it works like a charm for me so far (I'm using it successfully with GPS and an OLED display).

But today I tried to turn off Wifi and Bluetooth via ESP.enableBLE(false); and ESP.enableWifi(false);. Unfortunately I always end up in a boot loop. It works when I disable either Wifi or BLE, but not both. When I try to disable both, this is logged every second:

>ESP32.getState();
={
  sdkVersion: "v3.1.3-dirty",
  freeHeap: 41068, BLE: true, Wifi: false, minHeap: 35068 }
>ESP32.enableBLE(false);
Erasing saved code.
Done!
ets Jun  8 2016 00:22:57
rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0018,len:4
load:0x3fff001c,len:2668
load:0x40078000,len:7304
load:0x40080000,len:5312
entry 0x40080274
E (540) spiram: SPI RAM enabled but initialization failed. Bailing out.
WARNING: Bluetooth is disabled per ESP32.enableBLE(false)
Guru Meditation Error: Core  0 panic'ed (StoreProhibited). Exception was unhandled.
Core 0 register dump:
PC      : 0x400d8b1c  PS      : 0x00060430  A0      : 0x800d915f  A1      : 0x3ffde6d0
A2      : 0x00000001  A3      : 0x00001e78  A4      : 0x00001000  A5      : 0x00000000
A6      : 0x3ffc40cc  A7      : 0x3ffd6944  A8      : 0x00000000  A9      : 0x00000001
A10     : 0x00000000  A11     : 0x0001e780  A12     : 0x00000005  A13     : 0x00000012
A14     : 0xffffffff  A15     : 0x0003ffff  SAR     : 0x00000019  EXCCAUSE: 0x0000001d
EXCVADDR: 0x0000000e  LBEG    : 0x4009b418  LEND    : 0x4009b423  LCOUNT  : 0xffffffff
Backtrace: 0x400d8b1c:0x3ffde6d0 0x400d915c:0x3ffde6f0 0x400f93a5:0x3ffde710
Rebooting...

I'm using the Adafruit Huzzah32 Board with Espruino 2v06.

I needed to reflash the board to get back access. Hope anyone has an idea why that happens.

Thanks,
Patrick