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What exactly did you initially do to bork it?
If that's simply a broken main after an update, just put an official update package in the userstore, install it via the diags menu (U. Update using update*.bin file on FAT partition).
If you want to avoid doing the JB over serial, make sure it's a FW version >= your currently installed one, while *still* being JB'able.
(You can start with a factory update package directly, no need to go through a production update first).
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