[Q] Stuck in bootloader after foolish attempt at flashing ROM topic

So being the hot headed fool that I am, I pretty much just upped and tried to flash a non-stock ROM onto my L90 D415 10c without reading enough about the process. I rooted with towelroot and got into the bootloader, then I thought that simply with an erase command and an update command my phone would just reboot with the new ROM on it, alas this was not true. What I did was
fastboot erase system
fastboot erase boot

After entering "fastboot update cmod.zip" there was a message:
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

My phone is now stuck in the bootloader, what do I do? Is there any way to restore it's previous settings/memory?

The two "guides" that I followed (pretty much exactly) were first this and then this.

Last thing that seems like it may help is when I type "fastboot continue", my phone ends up with a message saying:
ERROR: Invalid boot image header

If anybody can solve this for me I would be eternally grateful. I've already learned my lesson, and I've got a feeling I'll be coming back to xda. For better reasons I hope. Thanks in Advance

EDIT: I guess I should add that I tried to flash the ROM in fastboot, which now that I think of it, I'm not sure is even possible? I do have my entire terminal history if that helps.