Use this reflash files in order to upgrade your firmware if you are on 6xR or 7xR E790 firwmare already. Theese shx files will not delete any settings, skins, media, phonebook or sms messages. It will preserve all your settings except if you have custom bootscreen or CG1 patches applied (will be reverted to standart).
Flash ONLY over E790 based firwmare (eg if you are already on one of the listed above). DO NOT flash over 4xR firmwares and reverse, because the flexes are incompatible