I have a jailbroken i4, all I have on here is ultrasn0w and signal to support the unlocker dev. I went into Cydia and saw updates for mobilesubstrate and ui tools and installed them. When I open skype it still has that modified firmware popup. Also, I didn't have mobilesubstrate listed under packages installed before but does ultrasn0w already do this? Does mobilesubstrate eat battery? Thanks.