So I switched cars with my sister's new allroad (01' tip, allroad k-box) to tune out her secondary O2's and EGT's, and ran into some issues an hour away from where she lives.

So I flashed an untouched (by me) AA-box tip S4 file, and the car ran fine. Then I tuned out the O2's and EGT's without correcting the checksums (this is my first foray into actually changing values in ME7, and I thought that I wouldn't need to correct the checksums for these simple 1 to 0 changes). The modified file flashed completely, and then the car wouldn't start (it would crank with no start). When I tried to connect via NefMoto to flash a working file back on, I couldn't even get nefmoto to connect ("slow init failed"). I tried every setting on NefMoto (fast/slow init, different bauds, even tried adjusting the settings on my com-port).  I then ran the files through ME7checker (should have done this beforehand), and the files that ran fine had no checksum errors, and the one that won't even connect had 6 checksum errors.

I don't have NefMoto logs on this computer, but it doesn't even get past connection ("slow init failed").

I unplugged the ECU for a few minutes and tried again, no go. Disconnected the battery for 10+ mins, no go. Pulled instrument cluster fuses, no go. Battery voltage was good (13+ volts, always connected to a charger into the wall). I've done everything that I've heard of, and no bueno.

I did a bunch of research, and it seems like my only/best option from here is to get a Galletto cable, get into boot mode and flash a working file.  Then flash it with NefMoto again to get rid of the checksum error.

Is that what I should do, or is there anything else I can try, so that I might be able to have a means of transportation before the Galletto cable gets shipped here?

I need to dig more into the Galletto stuff in the meantime, but I don't "need" a bench harness/power supply/etc., right?  I can do it in the car over OBDII with 2 people, yeah?

Thanks for the ideas.  I read when you said this in a different thread, when I looked in the manual at the fuse locations, I didn't see anything that was ECU specific. You remember fuse #'s by chance?

Word to your grandmother.