Instruction on read and write an ECU BOSCH ME7.4.6

I must change my ECM Bosch ME7.4.6 (on Citroen C5 V6 210HP 3.0l petrol) and I try to retrieve the contents of the eeprom 25C16 (immobilizer) and eeprom AM29ff400 to rewrite on the new (used). The BSI is original.
I currently own the Citroen tools after sale (Diagbox-Lexia) that does not allow access to the contents of the eeprom 25C16.
I wish to prevent desoldering components.
I wonder if I can use a Galletto V2 with BDM probe (JTAG) and if so how in practice. I noticed that on the ME7.4.6 there was a series of copper pads probably destined for testing and programming module.
Then I got reply that reading: you cannot connect to ME7.4.6 with BDM…there is no pins on it.
You have to work in boot mode.

Full backup in boot mode can be done with KTAG – that’s the best choice, than you can make complete clone of the ECU.
But desoldering immo chip is very easy¬†¬†2min job…

Flashing of eeprom can be done with galletto in boot mode or mpps v12 as well (generic mode). PS: a galletto 1260 is enough, with MPPS V12, the connections with the plug OBD are the same that with Galletto.