SoftBank 920P User Manual page 255

Note
Software Update failure may disable 920P. Contact SoftBank Customer
Center, Customer Assistance ( P.20-34).
Software Update does not affect Phone Book entries, files saved in
Data Folder or other content, but it is recommended that you create a
backup, as appropriate, of any important information and data (note
that some files cannot be copied).
SoftBank is not liable for damages resulting from loss of data,
information, etc.
Alarm tone does not sound during update.
For more information, visit SOFTBANK MOBILE Corp. Website
(http://www.softbank.jp).
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