QDloader 9008 issue

Hello all,

I'm new here, and I searching since many time a solution for my issue.
I'm technician for a company in France, that import professional PDA's from Korean. These devices are strong, and a little "expensive"... So when a customer send me a device for RMA, I need to found the best way for solve the issue, without change parts.

At this time, I'm facing to the issue below :
Lot of devices come in RMA because they can't boot. When I plug the device to my computer, I see Qualcomm HS-USB QDloader 9008 in port COM list.
For the manufacturer (we work direclty with him, no "intermediary"), the only way is to change the main board. OK but I'm not stupid, and I konw that they want sold main boards
I know that the main board is bricked and the device boot in EDL mode, no command can't be send (ex adb), and no screen boot.
Impossible to acces to the bootlader with touch combination.
I have the OS files on my computer (boot.img, emmc_appsboot.mbm, rpm.mbn, NON-HLOS.bin etc...)
The CPu is MSM8916, so I tested with QFIL and Miflash to send send files but nothing good :/ MiFlash told me that the "device is busy", and QFIL told me that there is a Sahara fail error".

So my question is : Can I save the main boards ? I think that there is some people here with more competent than me

For information, I have try 1 year ago with Miflash, and I saved only ONE board with Miflash and Xiaomi OS (I try the OS of the redmi because this phone work with the same CPU) ............. Only one file of the OS was sent by Miflash (before a crash of Miflash), but the main baord was save ^^ So I think that it is really a little problem, maybe an only one partition corrupt ....

I can take pictures of the board if needed.

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