Can't write to one PCM, can't read another vehicle

[King-918]

First problem I have a stock 2004 tahoe, hptuners pro, and a RCA cambio 10.1 windows10 home OS 32bit. I can't read the ecm in fast mode and give a x7f fail with a download timeout but if i cycle the key a few times it will read in slow mode but that tales 30 minutes just to pull the file. Write time is normal. I've updated everything on the OS I can use scanner like normal on both vehicles. I also have tried my old laptop with the same issue it was a. HP runing windows 10 pro 64 bit.
The ECM problem is a when using a homemade bench tunning tool my 2002 2wd suburban ecm will read in fast mode and scan but will give me a x7f fail code when writing.

Please help and thanks in advance

[Keith@HPTuners]

What version of VCM Editor?

What's the power output of that supply?

[King-918]

I'll have to check the vcm editor version when I get home but I'm pretty sure it's the latest one

[King-918]

Here is the editor version

[King-918]

Help?

[2xLS1]

Does your 04 Tahoe have an aftermarket radio, remote start, or alarm?

[King-918]

Yes radio but I unplugged it all. Should p pull a fuse too?

[2xLS1]

Is the chime adapter still plugged into the harness?

[King-918]

I'm sure it wasn't but ill make a video tomorrow