you need to post you fastboot getvar all values and the steps you are taking in sequence to find out what are you trying to do.
So what I am ultimately trying to do is get SIM2 working again properly, assuming it is a software not hardware issue. I believe the issue is that I have some partitions with x.xx.402.x and some with x.xx.401.x. I had hoped that I could apply a 401 RUU - but with everything I've tried QSC fails to flash. My QSC version is E1237.29.35.0108 and because the QSC update always fails it doesn't get downgraded.
My steps so far are:
getvar all (to start with):
(bootloader) version: 0.5
(bootloader) version-bootloader: 2.49.0000
(bootloader) version-baseband: U3.14.3509.14
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 4.21.402.5
(bootloader) version-misc: PVT SHIP S-OFF
(bootloader) serialno: HC36XW******
(bootloader) imei: 355868054******
(bootloader) meid: 00000000000000
(bootloader) product: m7cdug
(bootloader) platform: HBOOT-8064
(bootloader) modelid: PN0771000
(bootloader) cidnum: HTC__001
(bootloader) battery-status: good
(bootloader) battery-voltage: 4125mV
(bootloader) partition-layout: Generic
(bootloader) security: off
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: dirty-f6d46eca
(bootloader) hbootpreupdate: 11
Although this doesn't show the whole story as it doesn't show QSC version - see 1st picture - hboot screen with 402 firmware.
Flash modified_wwe_firmware_2.41.401.1_apply_to_x.xx.402 .x_version in hboot - See 2nd & 3rd pictures - flashes OK
I then changed the CID to HTC__A07 and flashed the firmware.zip from OTA 2.19.401.1 See pictures 4 & 5 - Note QSC Fail
I then flashed the 2.19.401.1 RUU in hboot - see picture 6 - note QSC fail.
At this point the phone will boot OK into 2.19.401.1 - but note in picture 7 that the QSC version has not been downgraded and I still have the problem with SIM2.
If I flash the RUU in RUU mode I get the same error becase at QSC, 100 it fails:
(bootloader) ...... Successful
FAILED (remote: 51 partition update fail)
finished. total time: 313.455s
but then the phone won't boot and you get the black screen htc and 4 triangles in the corner.
I have tried with the Chinese firmware also but also get QSC partition update fails.
So I don't think it is possible to downgrade QSC - I'm note sure what is stopping it - partition size, flash security, actually held in QSC memory etc and hence why I was looking at individual mmc partitions and asked for the partition table.