For 07k Jetta 2.5 with ECU 07K906032BC, there is an manual firmware that is compatible with this ECU?
Yes, 06A 906 032 QF should work
You are "very lucky" with this ECU.
As relative cheap solution you can use china KESS clone to r/w per OBD or read only in boot.
MPPS or Galletto2 will not work.
Original chip tuning tools from other brands will be expensive.
If the task is a one-off and consists of reworking the ECU to support manual transmission instead of automatic transmission without any configured patches in the original firmware, simply reflash it using the Odis service tool (or VAS-PC) to software 8E2910560C, and then change the ECU coding to 07717. To do this, you will need to buy a VAS5054A device
ST10Ripper should work over K-Line on his ECU, it supports KWP2000 and I have done multiples ECUs with the same configurations :
Key−Word−Protokoll
Kd−Diagnose TP2.0/KWP2000
OBD−Diagnose ISO−Can (OBD on Can)
Flashprogrammierung TP2.0
he should at least be able to connect to the ECU, but it seems he can't even initialize a KWP2000 session
MPPS can also read the flash over TP2.0, it uses checksums to map the memory and create a readout (about 30 minutes). Agree using ODIS might be easier for him if he is only looking to convert it
Got an error with st10 ripper
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Latency set to 2 and cable is powered by a FTDI chipset ? Are you able to connect to the ECU using NefMoto ? (Read id and DTCs for example)