Method 2.OBD on Bench
*This may only read ID but not full flash file because IMMO/ gateway not present blocks read/write instruction, so will only work in vehicle not on bench OBD
Also with VAG UDS via OBD, ECU must get immo clearance to enable write
Method 3.JTAG/ BDM
Solder 2 links on backside.
On front side solder the rainbow flat cable.