hotfix_SN_1

PRUSA_SN: Always check available on serialPort 0.

Hotfix SN

Get SN while not in farm mode.

Tested on USB CDC. Should work also with RPI port but it wasn't tested.

Doesn't work on RPI port - reason yet unknown.

USE_MK3_FARM_BOOT_v3

Do not skip bootloader when initiating reset by farm PRUSA RESET comm…