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SD Card Snafu--No System.img

Hi all,
recently, I was able to flash the new JB Hydro but it was stuck on the boot animation so I decided to do a full fresh install of a different rom, maybe CM10. Therefore via fastboot I wiped everything.
'fastboot erase recovery'
'fastboot erase boot'
'fastboot erase system'
'fastboot erase userdata'
Now, I figure I should be able to boot by flashing my system.img and boot.img
('fastboot flash recovery cwm.img'
'fastboot flash boot boot.img'
'fastboot flash system system.img')
I have CWM Recovery flashed already..buut, i am unable to flash the boot.img and system.img because I cannot find them..I mean when i extract the .zip to the fastboot folder all i have is a system folder, boot.blob and some META info..I flashed the boot.blob (fastboot flash boot boot.blob) but i cannot do the same for the system..So please tell me how I can flash the system.img...because I am unable to find the system.img (even via explorer)
Thanks in advance.

How to get the original ROM back?

Well I need to send in the Chacha because of some Hardware issues, so I'd like to restore the original ROM.
What's the easiest way getting it back (maybe with the option not having to root it again afterwards, or restoring the Clockwork-Backup)?

The best way is to download RUU, extract from it rom.zip and from that zip extract system.img, boot.img and recovery.img. Then flash those three via fastboot using these commands:
fastboot flash recovery recovery.img
fastboot flash boot boot.img
fastboot flash system system.img
And reboot your phone and you will have stock rom with stock recovery on it. Then you can use OTA update if available.

[A510] I need stock system.img

I need stock system.img in order to flash it via fastboot. I have deleted my recovery and now i have no rom installed so i need these files. Hope someone can uploaded them fast because i am running out of time.

As said by PM
Reboot in fastboot, and do
fastboot boot recovery.img
(using CWM or TWRP)
In recovery, you will be able to flash a ROM or restore a backup.

Can't flash or boot a recovery

I recently tried to install multirom but it kinda messed up, Now I can't either do fastboot boot recovery.img or fastboot flash recovery.img cause none of them works. I also tried to recover stock firmware but it didn't help. any help is appreciated.
I can boot into stock recovery via fastboot boot recovery.img but cannot boot a twrp or cwm.

Not loaded in recovery mod

Not loaded in recovery mod.
I flashed through fastboot nv-recovery-st-wx-na-wf-4.1.0 firmware
fastboot flash recovery recovery.img
fastboot flash boot boot.img
fastboot flash system system.img
fastboot flash userdata userdata.img
fastboot flash staging blob
In rekaveri does not go, the firmware is loaded.
I tried to flash twrp-3.0.2-2-shieldtablet.img, but also does not go into it. Just shows nvidia inscription.
What prompt do? It is necessary to go to recovery!

I flashed
nv-recovery-image-shield-tablet-factory.zip most original firmware.
fastboot flash recovery recovery.img
fastboot flash boot boot.img
fastboot flash system system.img
fastboot flash userdata userdata.img
fastboot flash staging blob
fastboot flash dtb tegra124-tn8-p1761-1270-a04-e-battery.dtb
I Nvidia after saying there's this
http://image.prntscr.com/image/64bb18f99d25468bb78aec67f7bd6fea.png
But it comes to recovery
http://image.prntscr.com/image/72805a63767148bab377a90d9b415623.png
everything is skewed
I flashed
twrp-2.8.7.0-shieldtablet
http://image.prntscr.com/image/836e3e3e40b94874b5a361a7f59d5b3b.png
What do I need to do?

I really need, if you not defective tablet (sent you to replace) 16 GB and a not new version of the tablet k1, please download the I
/dev/block/mmcblk0p24

If you have a version of the tablet with 16 GB and the battery b01, please copy me the file
/dev/block/mmcblk0p24 me it is very necessary. Without it, the tablet does not work.
PLS!!

It must be copied from the advanced> file manager from twrp