Cydia updating sources bad url
If your device finishes reloading data and then pops up a black screen including red and yellow errors, they usually indicate a problem with one of the repositories you have installed (or sometimes one of the packages).Cydia is still working fine, but you may want to try refreshing data again or removing the broken repository. Tai G provides an i OS 8.4 and 8.3 untethered jailbreak. Then I go to /var/lib/apt/lists/ and rename the old file cydia.zodttd.com_repo_cydia_dists_stable_main_binary-iphoneos-arm_Packages. Check @Pangu Team, @taig_jailbreak, @saurik, and /r/jailbreak for news and updates. This usually means that one of your installed packages is broken or misbehaving in some way.Follow the instructions on the Safe Mode help page to solve the issue (including uninstalling recently-installed extensions, checking for i OS version compatibility, and making sure your packages are from trusted sources).Often the best way to save battery on your device is to turn off Wi Fi and 3G when you do not need them for a while.Other than that, you may see a bit of increased battery usage from extensions and tweaks that use the internet frequently (such as ones that check for mail, check the weather, or activate a personal Wi Fi hotspot) or change the screen frequently (such as video wallpapers and animated lockscreens).
You can use Cydia Impactor if you need to un-jailbreak an 8.1-8.4 device without restoring.
After that I got an error "problem with mergelist /var/lib/apt/lists/cydia.zodttd.com_repo_cydia_dists_stable_main_binary-iphoneos-arm_Packages".