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Unlocking/S-Off 2019?

I'm still using a Dinc4G because nobody makes phones this small and inexpensive anymore. I recently bought a second phone of the same model for backup purposes in case I lose my primary phone, and I'm trying to unlock it's bootloader.

I went through the process of unlocking/flashing/rooting years ago, but the methods I went through no longer seem to work. My ROM is 2.19.605.2, and apparently you can't downgrade the phone to 2.17.605.2 for the original unlock/CID method.

The custom package on rumrunner.us is supposed to be able to unlock and S-off the phone right out of the box, but every time I run it, I get an error that says, "FATAL: download updated package on rumrunner.us". I've tried this on both Windows 7 and Windows 10 (and have used the fastboot registry fix on Windows 10). I've tried various driver versions, Google drivers, disabling firewalls, and nothing seems to work.

I know my chances of getting any help with such an old phone are slim, but I'd be super grateful.
 

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