A: Yes, but you must use the SP Flash Tool on a PC to overwrite the bootloader. Normal recovery downgrades often fail due to anti-rollback protection.
Before updating, you must confirm your current version to avoid "bricking" (rendering unusable) your device: uis8141e firmware
Reach out to the store where you bought the unit (AliExpress, Amazon, etc.). They often have private Google Drive links. A: Yes, but you must use the SP