Very important!!! This is not first time with this mcu 5M48H and vvdi Pro. When the prog not cracked sec for the first time then you have corrupted p-flash, always in the same place. I recommend the use of hot air to heat the mcu only on the time to reset sec. When you reading backups then no needed to heat.
Thanks to @eagleone-two (DK member)
Xhorse engineer reply:
One year ago, the wiring diagram is already included in the VVDI pro user manual. For the specific reason, it is relatively complicated, any question, contact email at firstname.lastname@example.org (Xhorse vvdi tech support)