xmichael
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- May 12, 2015
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Hello. Just bricked my DVR by flashing .bin firmware from different vendor (from similar device)... The device is on A7LA70 SoC. There is "ESR818" written on PCB.
The problem is that I can not connect it to PC in recovery mode. I figured out that connecting cable while pressing "Menu" button brings device in different state that simply powering it on or plugging cable in (though also tried other buttons). Then OS tries to detect USB device but it fails. On Windows it fails with "Unknown device", and says that device reported failure and cannot be connected (so I can not even try to install driver manually). On Linux it fails with "unable to enumerate USB device" and different error codes (-110, -73...).
I tried 3 different miniUSB cables, connecting to different ports on PC, but no luck. I know that I should try connecting with OTG cable, and I will try today... So here is my questions:
The problem is that I can not connect it to PC in recovery mode. I figured out that connecting cable while pressing "Menu" button brings device in different state that simply powering it on or plugging cable in (though also tried other buttons). Then OS tries to detect USB device but it fails. On Windows it fails with "Unknown device", and says that device reported failure and cannot be connected (so I can not even try to install driver manually). On Linux it fails with "unable to enumerate USB device" and different error codes (-110, -73...).
I tried 3 different miniUSB cables, connecting to different ports on PC, but no luck. I know that I should try connecting with OTG cable, and I will try today... So here is my questions:
- Is there any lower level possibilities to load firmware to device (JTAG etc)?
- Is there a way that wrong firmware may damage some code responsible to recovery mode?
- At this moment I only have few .elf's from the vendor of my DVR, but for different models (A7L50D and different sensor). Can it be used to recover my DVR and then flash stock .bin firmware at all?