Looking to run a vanilla OpenWRT firmware to replace the GL version of OpenWRT. However, not all GL products are listed on the OpenWRT pages as supported. How can I install a vanilla OpenWRT on GL devices not listed on the supported devices page?

Particularly referring to GL-X300B model, which shares very similar spec (albeit without Wifi) compared to GL-X750V2 (which is listed on OpenWRT as a supported device). Would the GL-X750V2 image work on the GL-X300B?

Any feedback is much appreciated.