blackra1n RC3 and blacksn0w have been released by GeoHot, both tools are used to Unlock iPhone 3G and 3GS on 3.1.2 firmware with 05.11.07 baseband, but like other jailbreaking/unlocking tools, users are experiencing issues on these tools as well. Top of the list issues are Youtube, WiFi and GPS application are not working after jailbreaking 3.1.2 firmware iPhone with blackra1n RC3, and unlocking with blacksn0w.
Following are some workarounds/resolutions to said issues:
NOTE: Your iPhone 3G/3GS should be fully unlocked by using blackra1n RC3 & blacksn0w. Click here for complete instructions on jailbreaking your iPhone with blackra1n RC3 and click here instructions on blacksn0w.
FIX-1: Reset Network Settings of your iPhone
As per GeoHot, he received enormous WiFi/Hotspot connection issues/queries from users who upgraded their iPhone using blacksn0w/blackra1n RC3. The resolution he recommended was to reset your network settings of your iPhone. Follow following simple steps to reset your iPhone's network settings.
Step-1: On your iPhone, go to Settings –> General –> Reset –> Reset Network Settings. You will see a "Reset Network Settings" button as shown below.
Step-2: That's it. Just touch this button and give a power cycle to your iPhone, i-e turn OFF and then turn ON your iPhone.
Please keep in mind that this isn't a permanent solution to this WiFi bug, it may arise again and you may have to perform same steps to reset settings again.
FIX-2: Install Push Fix Application on your iPhone
Push Fix application from Cydia is used to fix Push Notifications on iPhone 3.1,x firmwares. Though it seems but unlikely, but installing this app on your iPhone 3G/3GS will fix the Youtube, WiFi and GPS issues caused by blacksn0w/blackra1n RC3. Follow the instructions here (Step-1 to Step-4) to install Push Fix application on your iPhone 2G/3G/3GS.
Do share if you come across any other resolutions to these issues.
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