I have a MR 18, firmware 25.9. So I used method C, as described in the WiKi devi for MR18. I cannot post the URL link here.
Now I connect the USB-serial and using putty I see very fast scrolling garbage and I cannot stop it. I downloaded Hyperteminal for Windows and that shows the same, but I was able to stop the scrolling of the screen.
I see this:
Meraki Atheros LinuxLoader MR18 built Jan 31 2014 15:53:22
test_memoryfailed RAM BORKED: (0xa0000000) 0x5a5a5a5a != 0x0
944x BootROM Ver. (asic) 1.0 [Nov 8 2011 13:42:57]
find_hif: bootstrap = 0x31459
Nand Flash init
hdr: [0xbd000400 : 0xbd000400 : 0x6fb4 : 0xe5c86b84]
nand_load_fw: read 13 pages
nand_load_fw: 0x10000 0x800 0xbd000bf0
nand_load_fw: 0x20000 0x800 0xbd0013f0
nand_load_fw: 0x30000 0x800 0xbd001bf0
nand_load_fw: 0x40000 0x800 0xbd0023f0
nand_load_fw: 0x50000 0x800 0xbd002bf0
nand_load_fw: 0x60000 0x800 0xbd0033f0
nand_load_fw: 0x70000 0x800 0xbd003bf0
nand_load_fw: 0x80000 0x800 0xbd0043f0
nand_load_fw: 0x90000 0x800 0xbd004bf0
What does that mean? Is it "dead"? How to revive it? Anyone seen this? Especially the bold highlighted sentence.
But when I disconnect everything, and boot up the Meraki AP as intended (original firmware), then it comes up in the Meraki dashboard. So the device works!