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May 22, 2015 Service bulletin

TT: Some vehicles may exhibit an error message when trying to perform a radio software update: ?Unable to...

Toyota technical service bulletin T-TT-0339-15 for 2015-2016 Toyota Sienna, 2014-2016 Toyota Tacoma and 2014-2016 Toyota Tundra and others.

Bulletin number
T-TT-0339-15
Component
Electrical system: software
Summary
TT: Some vehicles may exhibit an error message when trying to perform a radio software update: ?Unable to update the software. Please try again later.? If the following screen is seen; follow the directions below.

Owners of these vehicles have filed 334 complaints in the electrical category.

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