Official updates will be made available OTA (over the air). The box will notify you of the update and offer to install it. Alternatively, any firmware update can be downloaded to USB stick and installed through system menus. Settings - About - Update.
To downgrade firmware first do a full / emergency firmware reflash (see link at bottom of firmware section for each model) then update to desired firmware.
Zidoo Z9S, Z10
- 2.3.80 BETA. 29-SEP-2021: http://forum.zidoo.tv/index.php?threads/beta-version-v2-3-80-for-z9s-z10-z1000-x20-x20-pro-uhd2000-released.91052/
- 2.3.32. 9-JUN-2020: http://forum.zidoo.tv/index.php?threads/new-firmware-v2-3-32-release-version-fix-for-seamless-branching.78544/
- 2.3.10. 9-JAN-2020: http://forum.zidoo.tv/index.php?threads/new-firmware-v2-3-10-version-for-zidoo-z9s-release.66276/
- 2.2.96. 21-SEP-2019: http://forum.zidoo.tv/index.php?threads/new-firmware-v2-2-96-version-for-zidoo-z9s-release.51434/
- 2.2.82. 12-JUL-2019: http://forum.zidoo.tv/index.php?threads/announcement-for-2-2-82.49272/
- 2.2.61. 27-APR-2019: http://apidl.zidoo.tv/Z9S/v2.2.61/ZIDOO_Z9S_N_v2.2.61_201904241902_ota-package.zip
- 2.1.30. 10-JAN-2019: http://forum.zidoo.tv/index.php?threads/new-firmware-v2-1-30-version-for-zidoo-z9s-released.44829/
Google AppsIf you want Google Apps reinstall after firmware: http://apidl.zidoo.tv/app/GappsInstaller-rtk-7.1_v1.2.4.apk
Emergency FlashUse only if anything goes wrong or if downgrading firmware:
- Z9S : https://www.zidoo.tv/Support/support_guide/guide_target/ua1h3YuLrJzeq7k9e%5Bld%5D3ulg%3D%3D.html
- Z10: https://www.zidoo.tv/Support/support_guide/guide_target/%2BNGNMlfRy9Xeq7k9e%5Bld%5D3ulg%3D%3D.html