Initially, I would reassemble the entire system, ensuring all connections are restored. I have observed that when moving a vehicle with the engine removed and connecting the battery, the wipers activate continuously, among other issues. After reassembly, if the vehicle is locked and allowed to enter sleep mode for five minutes, using the fob to unlock can resolve some problems. If this fails, I employ a diagnostic tool; I utilise a high-end Autel device that allows for the resetting of the ECU's short circuit protection via software. Additionally, once reassembled and after the sleep period, attempting to start the vehicle normally, then switching off and repeating this process several times can aid in restoring functionality. I am meticulous about disconnecting the battery on all vehicles I service, as incorrect voltage or wiring can cause significant damage. For resetting the FRM, I use Dtronix in Bristol, which also operates on eBay. If my suggestions do not yield results, the alternative is to send the FRM off for software repair.