I'm experiencing the exact same issue, black screen and LED blinking with 2 orange and 5 white color. interestingly, this problem seemed to have surfaced right after a series of Windows updates. In a desperate attempt to resolve the issue, I followed Dell's BIOS recommended recovery process, but unfortunately, it didn't yield any positive results.
If anyone has experienced a similar situation or has any suggestions on how to tackle this problem, your help would be greatly appreciated.
Realtek RTS5450 (and probably RTS5455 too) has integrated MCU with internal flash.
The flash can be programmed through I2C but the protocol is not published...
Thank you for the fast response, it looks like something changed but still no video. And I just discovered that EC flash is blank and I don't have a backup dump ...
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