Edit: Copied TWRP (provided by NayamAmarshe) and your TWRP backup to a microSD card. Booted into TWRP and did a complete wipe (wiped everything), no operating left on my box.
Booted back into TWRP and restored YOUR backup. After the restore, still only had Widevine Level 3. Did a factory reset and still only Widevine Level 3.
BUT, it is just like it came out of the box, again, minus the Widevine Level 1.
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