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As far as I can remember U have to update bootloader with TFTP that is file SX300-boot13506.rfb(The bootloader is the stepstone to the next FW update) and then u can further update to FW14114 and on
Here the link with 1.3.0.62 and then the onward 1.4 series after 1.3.0.62 do 1413 then 1424 then 14114 and at last 14145 whick is last one https://www.dropbox.com/scl/fo/uqyqf5w0dafd1a0qlb08o/ACBzRr8B_ZnznzEorwFWfmc?rlkey=10aut7a1g32m1qe2exmchp...
