ICS - Gingerbread

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Hello i have a question
if i ever need to go to at&t i need to go back to gingerbread
can anyone tell me how to safely go back to ics

This... 【Guide】How To flash ANY Captivate ROM from Stock (including ICS)


Sent from my SAMSUNG-SGH-I777 using xda premium

Okay well to put it simply, just flash a GB kernel like speedmod through ODIN, download the stock KK4 at&t rom (I think there's a full dump of it in the previous post), and flash it through CWM once both of those steps are done. If you want your kernel to be back to stock, then find the stock KK4 kernel and flash that .tar file through ODIN as well after you've done the last two steps outlined. An alternative to that would be Heimdall one-click to stock KK4 package which would totally put it back to stock.