关于刷ubnt的错误提示？求救

包***

，我有两种相同ap93的板子，这两块板子在外观上是一模一样的。
其中一块（硬件型号ap93-VER.B。配置是7240+9283.）这一块成功刷ar7240+9283的ubnt固件，但是同样的固件刷到另一个板子上（硬件型号ap93-VER.D配置是7241+9283）的板子上出现以下错误，网口和无线都无效。

U-Boot 1.1.4 (Apr 22 2009 - 17:30:22)

Board: Ubiquiti Networks ar7240 based board
DRAM:  64 MB
Flash:  8 MB
Net:   ag7240_hw_start: MDC check failed
eth0, eth1
Hit any key to stop autoboot:  0
## Booting image at bf050000 ...
   Image Name:   MIPS Ubiquiti Linux-2.6.15-5.2
   Created:      2011-12-19  18:46:48 UTC
   Image Type:   MIPS Linux Kernel Image (lzma compressed)
   Data Size:    779136 Bytes = 760.9 kB
   Load Address: 80002000
   Entry Point:  80002000
   Verifying Checksum ... OK
   Uncompressing Kernel Image ... OK

Starting kernel ...

Booting...
...mounts done
...filesystem init done
...base ok
...update ok
...symlinks ok
...httpd ok
...detect ok
...running /sbin/init
[4294673.302000] Oops[#1]:
[4294673.302000] Cpu 0
[4294673.302000] $ 0   : 00000000 00000002 c02a0000 00000000
[4294673.302000] $ 4   : c02a42d0 c02a47c4 00002342 8022e288
[4294673.302000] $ 8   : 00002313 00000036 00002342 80230000
[4294673.302000] $12   : 80230000 80230000 8134fc8e ffffffff
[4294673.302000] $16   : 00000001 00000000 ffffffff 8134fe34
[4294673.302000] $20   : c02a3d1c 00000001 c02a4548 8134fe90
[4294673.302000] $24   : 00000001 00000006
[4294673.302000] $28   : 8134e000 8134fde8 00000000 c0276f50
[4294673.302000] Hi    : 0125f200
[4294673.302000] Lo    : 010133c0
[4294673.302000] epc   : 00000000 _stext+0x7fffdbf0/0x34     Tainted: P
[4294673.302000] ra    : c0276f50 hooks_set+0x48/0x168 [ubnt_poll]
[4294673.302000] Status: 1000cc02    KERNEL EXL
[4294673.302000] Cause : 10800008
[4294673.302000] BadVA : 00000000
[4294673.302000] PrId  : 00019374
[4294673.302000] Modules linked in: ath_pci rssi_leds fuse option airprime usb_s
torage usbserial cdc_acm ar7240_gpio ath_dev wlan_me wlan_xauth wlan_wep wlan_tk
ip wlan_ccmp wlan_acl wlan_scan_sta wlan_scan_ap ath_rate_atheros ath_hal ubnt_p
oll wlan sd_mod pppoe pppox ppp_mppe ppp_async ppp_generic slhc crc_ccitt vfat f
at nls_iso8859_1 nls_cp437 scsi_mod nls_base ag7240_eth michael_mic des aes
[4294673.302000] Process rc (pid: 922, threadinfo=8134e000, task=803297f0)
[4294673.302000] Stack : 83a910cc c029aef1 c029aeec 00000000 c02a0000 c02765f8 8
02274e0 800586e4
[4294673.302000]         4eefa28b 35f7a4b0 00000000 83b845e0 83abd2ac 8022751c 0
3af969b 800754fc
[4294673.302000]         00000000 00000001 8134fe35 310a0000 00000000 00002302 8
03c964c 80227510
[4294673.302000]         803297f0 8134ff30 ffffffff 80351400 81309e00 00000002 0
0000001 2ac332e8
[4294673.302000]         c02a3d1c 00000000 00000000 8002becc 80060eb0 8134feb0 8
10ab000 00002301
[4294673.302000]         ...
[4294673.302000] Call Trace:
[4294673.302000]  [<c02765f8>] __mod_vermagic5+0x88008/0x887d0 [ubnt_poll]
[4294673.302000]  [<802274e0>] raw_proc_init+0x34/0x48
[4294673.302000]  [<800586e4>] __handle_mm_fault+0x23c/0x7b8
[4294673.302000]  [<8022751c>] arp_init+0x1c/0x8c
[4294673.302000]  [<800754fc>] may_open+0x80/0x22c
[4294673.302000]  [<80227510>] arp_init+0x10/0x8c
[4294673.302000]  [<8002becc>] do_rw_proc+0xfc/0x10c
[4294673.302000]  [<80060eb0>] nameidata_to_filp+0x4c/0x64
[4294673.302000]  [<8002bf04>] proc_writesys+0x28/0x34
[4294673.302000]  [<80063960>] vfs_write+0xc4/0x148
[4294673.302000]  [<800789c8>] dupfd+0x12c/0x264
[4294673.302000]  [<800739b0>] getname+0x2c/0x100
[4294673.302000]  [<80064148>] sys_write+0x54/0xa0
[4294673.302000]  [<8000ed40>] stack_done+0x20/0x3c
[4294673.302000]  [<80079024>] sys_dup2+0x0/0x168
[4294673.302000]
[4294673.302000]
[4294673.302000] Code: (Bad address in epc)
[4294673.303000]

Please press Enter to activate this console.

UBNT login: ubnt
不知是何原因，请各位大侠相救，付费也可

另外，我试着又找了几个固件分别刷到这两种板子上，两块7241无线桥接速率最高只有90m，而两块7240的板子桥接一直最高都是150m。不知是何原因