******************************************* THIS FOLDER CONTAINS EXPERIMENTAL FIRMWARES. THIS IS FOR DEVELOPER/TESTER ONLY, NOT FOR OFFICIAL RELEASE. ******************************************* - os_219_rev4_w5500.bin: firmware 2.1.9(4) compiled for os3.2 that supports W5500 Ethernet module. Requires W5500 Ethernet module and pin adapter. The firmware will NOT work with ENC28J60 Ethernet module -- the current official release of firmware 2.1.9(4) supports ENC28J60. - os_219_rev5_enc28j60.bin: firmware 2.1.9(5) compiled for os3.2 that supports ENC28J60 Ethernet module. - os_220_rev1_test.bin: test firmware 2.2.0 (1)