Exclamation [Q] Can't update over OTA

Hello there, this is my first post in this section.
Recently i recieved an used acer iconia tab a500 from a relative, and it is running 3.2.1 (acer_a500_7.014.14_COM_GEN1). i wanted to update it OTA to ICS, and when i tried )downloaded the update enchancement app and the package itself. it shows a triangle over the honeycomb logo when it reboots into "recovery". out of curiosity i tried to boot into recovery and to my surprise it was running CWM recovery 5.0.0.0 thor2002ro rev 1.3.4...
i saved the fil˝e afterOTA generated to my desktop so i have my cpuid and the generated sbk, but from that point onwards i dont know what to do.... this is unlike any android device I owned )xperia x8, galaxy s2 and s4 so far...)
what can I do to update to ICS over OTA? it doesnt show an error of any kind...
thanks in advance for reading this and sorry for any bad grammar or mispellings.