My version of MC3336 inverter firmware as i got it from the seller. Note: You need to have a USB communicator for firmware to work.
One can get cable and firmware from here as well https://pl.aliexpress.com/item/4001184242794.html
Note: If active Fault code 1 long 8 short alarm means BMS fault. If no BMS is used, then try to change firmware option F43 into 32.