Offers direct firmware downloads (approximately 720 MB) at OneTV-SRT .
Often hosts eMMC pinouts and software for this board at Remont-Main.ru . Download MS638 PC822 3840x2160 Mitashi Ref35 part03 rar
A common source for USB firmware and eMMC dumps for the MS638 series, available at KenotronTV.ru . Offers direct firmware downloads (approximately 720 MB) at
Occasional Google Drive links are shared via technical communities like Advance Electronics on Facebook . Installation Instructions Download MS638 PC822 3840x2160 Mitashi Ref35 part03 rar
Do not power off the TV during this process, as it can permanently damage the motherboard.