Hello,

I have RD-PQ device in bricked state.
I.e. the device does not react to pressing <Power key> or <Volume
down> + <Power key>.

But I can start developer and recovery mode via
<Volume up> + <Volume down> + <Power key>
I see here
Samsung SPL bootloader
version - 0.3-8c0cdaac

and after that
<Volume up> after <Volume down> after <Power key> for Developer mode
or
<Volume down> after <Volume up> after <Power key> for Recovery mode

I have the following items of menu in Recovery mode:
>From SD Card
- Recovery 2nd bootloader from sd card

>From Internal Card
- Recovery 2nd bootloader from internal card that image is fused at shipped

I chosen(for experiment :) second item(from internal card) and I,
think, it broke the device.
I.e., I think, second bootloader is broken.

Which bootloader(or something else) is responsible for download mode?
Can I recovery the device via first item(from sd card)?
How I have to prepare sd card for this?

If it impossible, can service center of Samsung flash device to a
state with working download mode? With internal debug port, as
exemple.

--
BR, Alexander.
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