Version/ModelLaunch DateOpenWrt Version SupportedModel Specific NotesA0A0, A0A12011-08since-A0A3 (sold as WZR-300HP)?Barrier BreakerJapanese modelA1A02011-11since r31678 or earlier?squashfs should work, jffs2 need flash erase size set to 64kB0A0 (marked WZR-300HP)2012-11Attitude Adjustmentsquashfs works, have not tested jffs2B0A1 (sold as WZR-300HP)?Barrier Breaker Snapshot r39382Might Work: SeeC1A0???r37793 or earlier?squashfs works, have not tested jffs2Hardware Highlights. Outdated information below? Please check and correct / update / remove as appropriate to get an up to date status.( Flashing Backfire to this router will brick the router ( solid red light ) as this version has a new ethernet driver ).As noted under current fimwares sometimes don't show the correct LED status (due to a bug). This means the flash might appear to have failed (solid red light) but instead was successful. After any flash it is therefore recommended to follow regardless of LED status.Hardware. Pin 1VCC +3.3VPin 2GNDPin 3TXPin 4RXSettings115200,8,N,1On the WZR-300HP, Pin 1 does not supply +3.3V. There is a 0 K resistor right next to pin one which can be bridged to complete the +3.3V circuit.
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Unfortunately, it is covered in solder now, but I believe that it was labeled R347 on the silk screen. Once this is completed, the serial console will function. If you are using a USB TTL cable, this may not be necessary.DO NOT CONNECT VCC, since this will most likely irreversably damage your hardware.JTAG. WZR-HP-G302H is Japanese market name for WZR-HP-G300NH2, and seems to have slightly different WiFi chip, Atheros AR9283-AL1A. It is very probable that WZR-HP-G302H A1A0 and WZR-HP-G302H A1A0 have an identical motherboar inside, as both have dual 16MiB SPI flash chips just like WZR-HP-AG300H, with erase size of 64k.
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This means default WZR-HP-G300NH2 jffs2 image will not work correctly (one can fix this by modifying target/linux/ar71xx/image/Makefile, search for WZR-HP-G300NH2 profile and change fs128k to fs64k). WZR-HP-G302H A1A0 motherboard silk-print label says:WZR-HP-G302HV221514W302HV21A2 Rev:A2Similarly to Japanese variant of WZR-HP-G300NH, A1A0 comes with locked buffalo u-boot v1.08 (based on U-Boot 1.1.4 for BUFFALO AIRSTATION, PB93), see for details. Furthermore, this newest buffalo u-boot BS does not even provide serial console at boot time! But TFTP “blind” flash to OpenWRT was possible when acceptopenrtfmt=1 was set (tested and confirmed ok with r31678 squashfs, try it at your own risk).
Also, it is possible to circumvent serial console lock by setting forceuart variable in a similar manner to acceptopenrtfmt.In addition, proper fwenv.config for uboot-envtools for A1A0 variant is:#MTD device name Device offset Env. Size Flash sector size/dev/mtd0 0x40000 0x10000 0x10000Here is the WZR-HP-G302H boot log of jffs2 image with unlocked serial and fs64k. In: serialOut: serialErr: serialMemory Testuboot use 83F6BFB0 - 84000000Memory Test start(80000000) end(83F00000) size(03F00000)Pattern 55555555 Writing. Reading.Pattern AAAAAAAA Writing. Reading.Pattern 00000000 Writing.
Reading.Memory Test OK### bufver=1.08 U-Boot Ver.=1.08### builddate(env)=Sep 26 2011 - 00:19:46 builddate(bin)=Sep 26 2011 - 00:19:46ag7240enetinitialize.Reading MAC Address from ENV(0x83f8c2f8)No valid address in Flash.
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