Originally Posted by dredlok706

Well, I did it
I downgraded PR 1.3 to PR 1.0
Generally, I used cert with PR 1.0 version. Then, I flashed PR 1.0:

Code:

sudo flasher -F DFL61_HARMATTAN_10.2011.34-1_PR_LEGACY_001-OEM1-958_ARM.bin -F mmc.bin -f --erase-user-data=secure --erase-mmc=secure

It failed at cmt-mcusw:

Code:

bb5_rdc_cert_read failed
bb5_rdc_cert_read failed
bb5_rdc_cert_read failed
bb5_rdc_cert_read failed
bb5_rdc_cert_read failed
bb5_rdc_cert_read failed
MTC_NOS_READY not received
MTC_NOS_READY not received
MTC_NOS_READY not received
CMT RFS failed
[Pipe   7] Finishing in error state with status 1

So I flashed CMT from PR 1.3:

Code:

sudo flasher -F pr1.3fw001.bin --flash-only=cmt -f -R

Now everything works Check screenshots
https://i.imgur.com/yjrHUbT.png
https://i.imgur.com/zGTPnMO.png
https://i.imgur.com/S2ag87a.png
So, finally, I can confirm, downgrade is possible