Iphone 4 backup question

i upgraded 5.1 5.01 on iphone 4 , saw considerable drop off in battery. 5.01 did worlds battery.

questions if have backup on computer of phone when running 5.01 backup restore phone ios? thank in advance

 

nope. backups personal data only, not os itself. there ways downgrade (sometimes), google have that. backup won't it.

 

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