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I team!

Before everything: congrats for all effort.  Easy Jtag Plus is a great tool.

Let's check the case: UFS change for Poco X3 Pro (Vayu)

•additional information:
CPU is not new
UFS is New (RPMB clean)

In my experience with change eMMC, RPMB clean after update FFU (great update, team), is just write eng firmware (Devcfg) device will start and will be possible to write RPMB in new Emmc: 
adb shell
qseecom_sample_client v smplap64 14 1

If just write a stock rom and don't use Devcfg file
 device will show:
Pres any Key to shut down
•no usb recognize
•no fast boot/recovery

So ... After change UFS for Poco X3 pro and write eng firmware by ISP connection (long time UFS  Samsung KLUEG8UHDC-B0E1) device show:

Press any key to shut down
•no usb recognize
•no fast boot/recovery

 

 
Have some opinion how to proceed?

I think  this process is possible because I saw a post in a relevant page:
https://www.facebook.com/EmmcAndUfs/posts/698159498989786

Any Suggestion? 
 

in Easy JTAG by (160 points)

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