Im also wondering why this firmware is for people who are outside of US.
See bullet points below:
* A person buys this AT&T exclusive phone, it is network-unlocked so that any SIM card will work (even those from other countries)
* That person brings the phone outside of the US but still plans on using it with a non-AT&T SIM card (a consultant, a businessman, a tourist, etc..).
Or maybe that person lives in another country and just wants to use this particular phone.
* However, AT&T OTA (Over-The-Air) incremental updates only work "within" AT&T network (an AT&T subscriber).
* Therefore, since that person is using a non-AT&T SIM on this phone, automatic OTA updates will NOT trigger/work.
* The solution is to "manually flash" the OTA update by obtaining a copy of that file--Then manually flash it, either via "Modified-ODIN" or via the "Standard Recovery Mode" -- This works, and should not stop people in the US (who are also AT&T subscribers) to use it.
* This is just a work-around-OTA-update (manual flash) for those people outside the US or for those people using a non-AT&T SIM card (US or non-US).
* It should be noted that an OTA update is only a PARTIAL update that is dependent on the currently installed version.
For example: If there is an update "version D" available, the person must ensure that his phone's current firmware is "version C". If not, then that person would have to find the missing updates first before flashing to the latest OTA: "ver A --> ver B --> ver C --> ver D"
This is time consuming and confusing to some, therefore... It is preferable to have ONE complete package, all-in.
* Thus the existence of this STOCK FULL FIRMWARE file. It contains the complete files and drivers necessary to quickly update that person's phone directly to the recent/latest version without worrying about version dependencies or incompatibilities.
* This full firmware update will ERASE your settings and data, so back them up with known methods.
* This firmware update will not change your network/sim-lock status. If yours is unlocked, it will stay unlocked.
This firmware update contains the following files:
AP_G891AUCU2BQB2_CL10651105_QB12578871_REV02_user_low_ship_MULTI_CERT_meta.tar
BL_G891AUCU2BQB2_CL10651105_QB12578871_REV02_user_low_ship_MULTI_CERT.tar
CP_G891AUCU2BQB2_CL10651105_QB12578871_REV02_user_low_ship_MULTI_CERT.tar
CSC_ATT_G891AATT2BQB2_CL10651105_QB12578871_REV02_user_low_ship_MULTI_CERT.tar
POSEIDONLTE_USA_ATT.pit (not required to flash this one, for advanced users only)
