Sellers often specify on their site if a device support Firmware OTA updates, or not.
If the OS is original android - why wouldn't it support Firmware OTA updates?
After I received a phone - how can I immediately check if it supports Firmware OTA updates, without waiting for the next update?
Examples for phones:
Scroll all the way down and look for this message:
Pls read me before you make order. we will open the original box to check the phone and install Multi-language ROM and Google play store. Official rom will be prefered. if custom translation may does not cover all the menus. Not support OTA update. <--<---<------ We may update the ROM, so the OS version may different as the screenshots.
In local stores I noticed it mostly about whether the device was bought from an official distributor, or from a parallel distributor.