Why USB Jig can’t reset custom binary download counter on my Samsung Galaxy S II? Hey, USB Jig is not working… Well, you might get a faulty USB Jig in this case but unlikely. Most likely, you have new bootloader that prevent USB Jig to reset custom binary download counter on your Samsung Galaxy S2. So how to reset custom binary download counter in this situation? Simple, install old bootloader on your Samsung Galaxy S2. And your USB Jig is back to business then.
How to install old bootloader on Samsung Galaxy S2?
The old bootloader installation process is the same as firmware installation using Odin. You can put the old bootloader tar file on either PDA or BOOTLOADER section. Then flash it. You can install new bootloader back after reset the custom binary download counter. But not necessary because nothing new in the new bootloader except disable USB Jig usage. Do visit XDA website if you need more information.
Installation guide – How to install firmware on Samsung Galaxy S2 with Odin? (Video)
Download old bootloader for Samsung Galaxy S2 I9100 here.