Keep holding until the update progress bar appears on the screen.
When downloading firmware split into multiple parts (e.g., part01 through part07):
: You must have every single part in the same folder on your computer. If one part is missing, the extraction will fail.
Once you have the extracted firmware file (typically named allupgrade_538_4G_sos.bin or similar):
) is essential for resolving issues like "stuck on logo" or system errors. Because these files are large, they are often split into multiple archives, such as "part07.rar." Firmware Overview : CV538H-A50 Resolution : 3840x2160 (4K UHD) Device : BBK 50LEX-6027 Update Method : USB Flash Drive How to Download and Extract