2011 corolla question

#1
Hello everyone ,
I recently bought a 2011 corolla and i have two questions about it :
1) i have a small screen infront of the cluster which has a 'service' text that buzz and flash when i start thw car and it has a micro B port , how can i use it ?
2) i think my stereo was changed with a 2008 model stereo (based on pics i found online) , how i can check which radio should my car has ? whether it has aux output ?


Thanks in advance
 
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