How to flash same firmware.bin for all particle electron boards?

how to flash same firmware.bin file to all particle electron boards

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i have gone through this and created a product and added 3 electrons (shows a different group in web IDE for these 3 electrons) and complied a code in web IDE (the yellow star on one electron (selected)) downloaded “firmware.bin” file and flashed through usb to another electron (not the selected one) but
the electron goes in safe mode for this…

shall i have to compile separately for each electron and then flash