[RAZR HD General] iBolski:
I tried what you did (I have an unlocked bootloader on my RAZR HD), trying to downgrade from 9.30 and I keep getting these error messages when fastboot flashing:

For system.img, I get the following:

(bootloader) Variable not supported!

target reported max download size of 31457280 bytes

Invalid sparse file format at header magi

error: write_sparse_skip_chunk: don't care size 814418508 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 782957132 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 751503948 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 720038476 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 688585292 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 657128012 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 627411532 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 595954252 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 564501068 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 533047884 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 501402188 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 469944908 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 438463052 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 407009868 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 375556684 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 344103500 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 312953420 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 281500236 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 249973324 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 218511948 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 187021900 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 155568716 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 124115532 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 92990028 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 61532748 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 33098316 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 1624652 is not a multiple of the block size 4096

sending sparse 'system' (30716 KB)...

error: write_sparse_skip_chunk: don't care size 814418508 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 814418508 is not a multiple of the block size 4096

OKAY [ 2.387s]

writing 'system'...

(bootloader) Unknown chunk type

FAILED (remote failure)

finished. total time: 4.516s

Various other issues also happen with some of the other files I try to flash.

For whatever reason, I cannot flash back to a previous SBF.

UPDATE: I modified the House of Moto scripts to properly reference the system.img (instead system.img.ext4) and that seemed to fix it. Not sure why it won't work doing it manually unless I'm not sending the correct command to flash the system.img.

The only other thing could be is I forgot to reboot after flashing aboot partition.

I'm now running on 9.16.6.

Thanks for the tips on getting this working!

Also, earlier, I tried HoM and it kept booting me back to 9.30. I found out that was because the flash scripts reference system.img.ext4 instead of system.ext. I had copied the older 9.16 SBF image over the 9.30 images in the HoM directory and the old scripts were still flashing the 9.30 system.img.ext4 image file.

Once I figured that out, it all worked flawlessly.

UPDATE 2:

well, I got the 9.16 to apply, and then it tells me there is an OTA for 9.18 and I click Download, but nothing happens. I keep going back to "System Updates" and checking. Somtimes it just stops, other times it will tell me there is an OTA, so I click "Download" and like I said, that's it. Usually, I get a download status window telling me how much has been downloaded so far, but not when I'm trying to update to 9.18.

I've tried this over both 4g and WiFi and it just won't download the OTA for whatever reason.

Grr...

This is just not worth it. Guess I'll forgo being a soak tester and just wait for the darned official OTA to come out that actually works with 9.30.

Very frustrating to say the least...