JUNOS software versions 15.1R3, 15.1R4 and 15.1R5 for the EX3200 were erroneously posted on the JUNOS download site . All maintenance releases of JUNOS software version 15.1 are not compatible with EX3200 product series. Customers must not upgrade the EX3200 to any of these JUNOS software maintenance release.
JUNOS software versions 15.1R3, 15.1R4 and 15.1R5, along with their Service Releases, have been removed from the JUNOS download site for the EX3200. Customers who have downloaded all maintenance release of JUNOS software version 15.1 are encouraged to discard the software and not upgrade their EX3200s.
The software has been removed from the JUNOS software download site as of January 10th, 2017. For recommended software, please consult KB21476 [juniper.net] .