Chosen Solution
iPhone board is unfortunately one of the disturbingly more common ones being reworked in a chinese lab getting in EU as refurb, thus no clear history. Had a badly reworked faulty audio IC that was fixed, yet it showed little glitches partly due to aftermarket parts fit in the housing. After everything was finally put together with known good parts a restore was started with iOs 12.4. Restore with iTunes got stuck first at verifying software, afterwords went into error 2012. 3Utools gets stuck at verifying filesystem, no error, it just hangs. I can’t find any error 2012 reference, I fear a Nand issue but before wasting time on it would appreciate any insight if someone has already gone through something similar.
The only experience I have with error 2012 is windows related, so not sure if you’re restoring from a windows machine. If so, it’s related to either pending windows updates or an out of date iTunes version. Check both and apply any available update first. Reboot and try again. If restoring on Mac, it can be caused by windows running inside parallels or VMware (or other virtualization software). Close the running VM, and the hyper visor itself to fix this.
