[Q] How to restore faulty SDBoot version flashing?

Dear all,

How do I restore my bricked 'X1 Prospero' that runs on Android?

I wanted it to upgrade with official update.img with bootable microSD-card, I've used Rockchip SD Firmware Tool v1.43 with SDBoot v2.16, but the use of that version of SDBoot was my fault, cause I needed to use this version of SDBoot v1.17 only, but I already flashed it with SDBoot v2.16 and now it hangs at bootup.

I've already tried flashing it back with SDBoot v1.17, but it was already to late.

Cause for some way SDBoot v2.16 changed something on the system structure and thats why it hangs at bootup.

Is there any way to restore or recover the Android system? Any instructions are very welcome and appreciated!

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