Default Problem with motorola milestone a853

Hi guys, i have a friend that upgraded to a new phone and he gave me his milestone...but when he gave it to me he didn't told that's stuck on the bootloader screen.
Oh and he said that it has this cyanogenmod 7 installed, but that's the only thing i know
i'm totally new to this so if u can help me it would be amazing.
when i turn on the phone it says:

Bootloader
90.73
Err:a5,69,35,00,23



Battery OK
OK to Program
Transfer Mode:
USB


and it does nothing else.
i tried enter the recovery menu but then a triangle with an exclamation sign and a cellphone on base appears


help!