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Just adding another successful data point for M-Link. My car is a 2025 Toyota GR Supra RZ (DB06, B58 Gen 2). I used M-Link to make a full DME backup first, then performed the unlock at home. The actual unlock process was very quick and straightforward. After the unlock, I installed bootmod3...

Quick update: I took the car to the dealer, and the issue turned out to be a poor connection. So fortunately, it wasn't a coding or head unit failure. Thanks everyone for the advice. Looks like Razors Edge was right — taking it to the dealer was the right call. 😅

Fair point. I mainly wanted to determine whether this was a coding/configuration issue before taking it to the dealer. I’ve now confirmed the HU is reachable, the main CID/APIX coding values look normal, and the faults point to HU-CID communication/HDCP. I’m not going to disassemble the head...

I reseated the display-side connector, but it still shows “NO SIGNAL.” I used this video as a reference for removing the display: If anyone sees anything else I should check on the display side before moving on to the head unit side, please let me know.

Thanks. I already tried the iDrive reboot and also disconnected the battery for over 30 minutes, but neither helped. I haven’t reseated the display cable yet. I’ll look for a video or guide showing how to access the display-side connector and may try that next. If anyone knows a good removal...

Hi everyone, I have a 2025 GR Supra 3.0 and the iDrive display first showed “NO SIGNAL” and now remains blank, while audio still works. BimmerLink shows these persistent Headunit High faults: B7F8C3 B7F8F6 – HDCP authentication failed Both faults return immediately after clearing. Has...

Has anyone here successfully used Toyota ISTA 4.57.x or 4.58.x on a 2025 GR Supra without an active GTS+ subscription? I only need diagnostics and test plans, not programming or flashing.