Ums5121h10natv Firmware Update Link -

You do not need a PC for OTA, but you cannot downgrade or fix a boot loop with OTA.

If you can share the and model number printed on the outside of your device, I can help you locate the specific manufacturer support page. ums5121h10natv firmware update link

there is no direct public record for a specific firmware update link labeled exactly " UMS5121H10NATV You do not need a PC for OTA,