How to re-install Android on HP Slate 21 when everything was erased?

Hello,
I recently bought an HP Slate 21 computer with Android system installed. My goal was to customize this Android for a specific purpose for my company. As an experience, I "rooted" this Android, installed some apps to modify the system at root level and, as I spected, the system began to fail at initializing.
I know this experience voided my warranty, but I had in mind that when it happened I was able to format, re-install the original Android and begin the experience again.
I followed and tried many times the tutorial for recovering through "Fast Boot Mode > Recovery Mode > Update/Recover...etc", I downloaded the "update.zip" file, tried it over SD Card and ADB Sideload, get many kinds of errors and nothing worked. Probably because I "rooted" the system and deleted important files.
The last thing I did was a general "clean up" via fastboot commands, as following:
> fastboot erase boot
> fastboot erase cache
> fastboot erase recovery
> fastboot erase system
> fastboot erase userdata
Now when I restart the computer it enters on Fast Boot Mode directely and the HP logo is gone. The Recovery Mode option also redirect back to Recovery Mode screen. That's obviously because I erased everything, I know. But I still have the fastboot commands via Terminal and I know that if I had the right files, I would be able to install the original Android again. I tried to "flash" the "update.zip" file via "fastboot update" but I had the following errors:
archive does not contain 'android-info.txt'
archive does not contain 'android-product.txt'
error: update package has no android-info.txt or android-product.txt
I know it is a shot in the dark but "update.zip" is the only source I know to try to bring the original Android back. I also read about the ROMs and images which do that, so, someone know where I found that image? Can I do that by modifying something in the "update.zip" package? There is some way to get the original Android back? Or I just lost my computer?
Thanks!

A shot in the dark as you have not mentioned the model you have but perhaps this site for your Jellybean
http://h10025.www1.hp.com/ewfrf/wc/softwareCategor​y?os=4153&lc=en&cc=us&dlc=en&sw_lang=&product=6967​...
Otherwise since this is a commercial product you may get a better response on the HP Business Forum
http://h30499.www3.hp.com/
Please mark my post as SOLVED if it has resolved your problem. It helps others with similar situations.

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