I still have problems with Puck.js and firmware update from 1.92 to any above, nRF Toolbox disconnects in 10 secs.
Taking Gordon's advice about the low battery, I even risked to burn it - powered it on 3.3 pin.
Still the same problem - nRF Toolbox connects for 10 secs and disconnect with error.
I already connected Puck with TTL now, but trying Espruino IDE it does not work either, returns the message Puck.js cannt be updated from IDE, make other choice.
The only way would be upload with phyton script (I use it successfully for flashing on ESP8266)
Please advice what is command line for Puck.js
for ESP8266 the command line is:
python "E:\Espruino\000 software\esptool-master\esptool.py" --port COM3 --baud 115200 write_flash --flash_freq 80m --flash_mode qio --flash_size 32m 0x0000 boot_v1.6.bin 0x1000 espruino_esp8266_user1.bin 0x3FC000 esp_init_data_default.bin 0x3FE000 blank.bin