Is posible to install wrt160nl software to e2100l hardware? I've read that are almost same, but need to be sure
Theorically they are the same:
https://wikidevi.com/wiki/Linksys_WRT160NL
https://wikidevi.com/wiki/Linksys_E2100L
Check it Out..
Didnt work 
What were the results? Did it failed to flash with an error? How did you flash it (TFTP?)...
From upgrade URL at original firmware, output Upload Error. Didnt try tftp.
Tryied through tftp, also failed.
No error message.
I'm not really expert, but i like to try new sw.