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Speedlite 600EX-RT and ST-E3-RT issue

When shooting with the Speedlite 600EX-RT and Speedlite Transmitter ST-E3-RT, linked shooting and wireless flash shooting with radio transmission will not work in some setting modes when seven or more units are linked. This phenomenon does not occur when six or fewer units are linked.

Units with a combination of 3rd and 4th digits in the serial number in the ranges shown below are affected. 
■ Speedlite 600EX-RT:
■ Speedlite Transmitter ST-E3-RT:
[xx01xxxxxx] ~ [xx13xxxxxx]
[xx01xxxxxx] ~ [xx03xxxxxx] 
Note:  If the battery compartment of an affected unit contains the marking illustrated below, the product is NOT affected by the phenomenon described above, even if the serial number is within the ranges mentioned above.
 Canon Speedlite 600EX-RT and Speedlite Transmitter ST-E3-RT          
   Speedlite 600EX-RT                                    Speedlite Transmitter ST-E3-RT 

A repair service will begin on 4 January 2016. 
To arrange to have an affected unit inspected and serviced for this phenomenon at no cost, take or send your product(s) to a Canon authorised service facility.
If you have any further enquiries, contact Canon using the e-mail support or telephone support option.
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