it is because is broken security part in rpl on n9 and since there is no backup of the original one you cant fix it unless there is new rpl file specific for that phone, which Nokia used to sell them to small cellphone repair shops

Hmm OK later i will see what can be done with ATF (Nitro)

tried that, getting this error

Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.

C:\windows\system32>cd..

C:\Windows>cd..

C:\>cd n9

C:\N9>Flasher -f -F china.bin --flash-only=cmt -f -R
flasher 3.12.1 (Oct 6 2011) Harmattan
ERROR: Only single flash option is allowed
ERROR: Error processing option -f

C:\N9>Flasher -f -F china.bin --flash-only=cmt
flasher 3.12.1 (Oct 6 2011) Harmattan
WARNING: This tool is intended for professional use only. Using it may result
in permanently damaging your device or losing the warranty.

Suitable USB interface (bootloader/phonet) not found, waiting...
Found device RM-696, hardware revision 1501
NOLO version 2.3.6
Version of 'sw-release': DFL61_HARMATTAN_40.2012.21-3.480.04.1_PR_480
Sending ape-algo image (7096 kB)...
100% (7096 of 7096 kB, avg. 14542 kB/s)
Suitable USB interface (phonet) not found, waiting...
Ping attempt 1 (250 ms)
Server application: 1.7.2
Found product RM-696 rev. 1501
Server implements softupd protocol version 1.8
Image SW version DFL61_HARMATTAN_40.2012.21-3_PR_003
Image cert-sw skipped
Image xloader skipped
Image secondary skipped
Image kernel skipped
Image moslo skipped
Image rootfs skipped
Image mmc skipped
Image tar skipped
Image config skipped

Battery level 27 %, continuing.

image [state progress transfer flash speed]
---------------------------------------------------------------------
[x] cmt-2nd [finished 100 % 95 / 95 kB NA ]
[_] cmt-algo [init 100 % 789 / 789 kB NA ]
[ ] cmt-mcusw [pending 0 % 0 / 0 kB NA ]
ERROR: SU_GET_UPDATE_STATUS_REQ terminated with error code 1: Unknown error

image [state progress transfer flash speed]
---------------------------------------------------------------------
[x] cmt-2nd [finished 100 % 95 / 95 kB NA ]
[f] cmt-algo [init 0 % 789 / 789 kB NA ]
[-] cmt-mcusw [pending 0 % 0 / 0 kB NA ]
Fetching error list:
========================================
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
Timeout while waiting for the HWBREAK
Could not reboot into cold bootmode
[Pipe 1] Finishing in error state with status 1
========================================

ERROR: Failed to flash images

C:\N9>Flasher -f -F china.bin --flash-only=cmt
flasher 3.12.1 (Oct 6 2011) Harmattan
WARNING: This tool is intended for professional use only. Using it may result
in permanently damaging your device or losing the warranty.

Ping attempt 1 (250 ms)
Server application: 1.7.2
Found product RM-696 rev. 1501
Server implements softupd protocol version 1.8
Image SW version DFL61_HARMATTAN_40.2012.21-3_PR_003
Image cert-sw skipped
Image xloader skipped
Image secondary skipped
Image kernel skipped
Image moslo skipped
Image rootfs skipped
Image mmc skipped
Image tar skipped
Image config skipped

Battery level 27 %, continuing.

image [state progress transfer flash speed]
---------------------------------------------------------------------
[x] cmt-2nd [finished 100 % 95 / 95 kB NA ]
[_] cmt-algo [init 100 % 789 / 789 kB NA ]
[ ] cmt-mcusw [pending 0 % 0 / 0 kB NA ]
ERROR: SU_GET_UPDATE_STATUS_REQ terminated with error code 1: Unknown error

image [state progress transfer flash speed]
---------------------------------------------------------------------
[x] cmt-2nd [finished 100 % 95 / 95 kB NA ]
[f] cmt-algo [init 0 % 789 / 789 kB NA ]
[-] cmt-mcusw [pending 0 % 0 / 0 kB NA ]
Fetching error list:
========================================
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
Timeout while waiting for the HWBREAK
Could not reboot into cold bootmode
[Pipe 1] Finishing in error state with status 1
========================================

ERROR: Failed to flash images

aha i dont have acces to them
ill check their interfaces later also i am out should be back in two days
most probably it should start with backup rpl pm then wipe phone and reflash
then check for simlocks to proceed
ok so to make the process a little more faster get your n9 to them ask why they coudnt repair it lisen to it then ask them to flash your phone then do a check info , simlock check , sx4 authorization
i dont know their interface so you may need to use a little common sence basically i want the logs or rather better click photos easiest
or if this is too much wait for me to explore
or rather remote me to the machine
i am just curious why the technician didnt check whats wrong yet
thanks

rpls are unique to each devices unlike pm actualy pm feild 308 and 128 which cannot be reconstructed so its advisable to backup
or it finally ends up in generating ask files and associated troubles there in
also i dont think nokia sold em ?
source ?

So can I make a backup of RPL file from working device? (before its dead?)

Yes, highly advisable

How can this backup be made? And how can it be used to recover N9 if the cmt issue arises?

no way if it is a HW issue...

yeah but there is no way finding if is hardware at all at least without rpl file

two technicians told me that they could fix it with new rpl file or they were shooting blanks who knows, but according to them is fixable with rpl