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Hi Noemi,Version 21.4R3.15 is only recalled for the QFX5110 and QFX5120, iirc it is not fully recalled for all platforms.For MX, EX, SRX etc 21.4R3.15 is no problem, though I am not sure about QFX5100. The KB article only lists 5110, but 5120 is definitely also involved in the recall as that one also no longer has 3.15 available and only has 3.16 available for download.
Hopefully JTAC will be able to give you a clear answer, but if I may give a recommendation: if you want to use 21.4R3 on your QFX5100 I would recommend downloading 21.4R3 and then the latest SR (I believe it is 21.4R3-S2 at the moment) as this will definitely have all the fixes that 3.15 was recalled for and some additional fixes as well.