Sony XPERIA 1 Instruction Manual page 249

Notes
Once the software update is complete, you
･
cannot restore the previous software.
While the software is updating, the unique
･
information of the terminal (model, serial
number, etc.) is sent to the server of
DOCOMO. DOCOMO does not use the sent
information for purposes except software
update.
While the software is updating, each function
･
may not be available temporarily.
By executing software update, some settings
･
may be initialized. Make the settings again.
If PIN code is set, PIN code entry screen
･
appears while the terminal is restarting after
the rewriting process. Enter PIN code.
If the software update failed and all
･
operations become disabled, please contact a
DOCOMO-specified repair office.
Software update is unavailable in the
･
following cases. Solve the phenomenon and
then retry.
- During a call
- Tethering in use as an access point
- When date and time are not set correctly
- When the remaining battery is not sufficient
- When the available memory is not sufficient
in the internal storage
- During International roaming
Do not turn off the terminal while updating
･
the software.
Stay in a place with good radio wave
･
condition when downloading the update file.
The update may be canceled if the radio wave
condition is not good enough.
Connecting to a PC to update
Install a software for "Software update"
beforehand.
For methods of software installation, refer to
the following website.
https://www.sonymobile.co.jp/support/ (in
Japanese only)
Appendix/Index
247