[Motorola Atrix HD] wadamean:
wassup everyone I have jacked up my atrix hd. I have a Mac with all the adb and fastboot commands working, just that I have tried to go back to stock with root in order to then go back to flashing roms. wassup everyone so i like soft bricked my atrix HD. i think it is called soft brick. So im unlocked bootloader and i am trying to go back to stock JB through fastboot which i am doing it through AP fastboot too. all the steps in skeeveydude's thread: http://xdaforums.com/show....php?t=2226527 they work except the system.img part. PLUS IM IN SUDO ADMINISTRATOR MODE TOO in Terminal on Mac. this is what i get when i try to flash system.img:

system.img

(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 517990560 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 486529184 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 455063712 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 423610528 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 392153248 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 360532128 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 329078944 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 297834656 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 266279072 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 236382368 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 204929184 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 173467808 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 142014624 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 111741088 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 81475744 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 50006176 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 18520224 is not a multiple of the block size 4096

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

error: write_sparse_skip_chunk: don't care size 517990560 is not a multiple of the block size 4096

error: write_sparse_skip_chunk: don't care size 517990560 is not a multiple of the block size 4096

OKAY [ 2.635s]

writing 'system'...

(bootloader) Unknown chunk type

FAILED (remote failure)

finished. total time: 4.032s

so do I need to use a windows computer to use RSD or Mythtools? Recovery works by the way but i too am having problems with it. I can still flash roms but they stay in a bootloop no matter what and adb is still recognized along with fastboot when i enter the recognition command on my ternminal (command prompt for mac). HELP!!!!!! I apreciate it. THANKS!