Had it not occurred to you that perhaps, just perhaps, you should give up trying to remove the back? If using a case knife isn’t a skill you have learned, you can do a LOT of damage when the case back suddenly pops off, and you skid across the movement with the tool.
While I typed the above reply, apparently you got the back off. Do you have a case press at the ready for when you try to put the back on?
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