yamori813

Missing operating systemと表示され、Windowsが起動しなくなったPCからディスクのサルベージを依頼される

起動後すぐにF2キーを押してもBIOSに入れず

F4キーでBIOSのアップデートツール(Easy Flash Utility)は起動できる

F9キーでリカバリの画面も表示される

キーボードが一部調子悪かったので、USBキーボードで試しても同じ状態

yamori813

CPU platform: Atheros AR2315 rev 0
CPU Frequency=184 MHz
CPU DDR Frequency=0 MHz
CPU AHB Frequency=92 MHz
platform frequency: 184000000
arguments: 
  a0 = 00000002
  a1 = 80030020
  a2 = 80030000
  a3 = 0000001b

yamori813

CPU platform: Atheros AR2315 rev 0
CPU Frequency=184 MHz
CPU DDR Frequency=0 MHz
CPU AHB Frequency=92 MHz
platform frequency: 184000000
arguments: 
  a0 = 00000002
  a1 = 80030020
  a2 = 80030000
  a3 = 0000001b

yamori813

RT1310+PCI RT2860+RT2820 MAC:0x28600103
RT2880 + RT2850 MAC:0x28600101
RT3052 MAC:0x28720200
RT5350 MAC:0x53500500


28600100 -> PCI?
28720200 -> RT3050/52
28830300
30700200

yamori813

db> where
Tracing pid 0 tid 100019 td 0xc06cc000
db_trace_self() at db_trace_self
         pc = 0xc024dd64  lr = 0xc001a028 (db_hex2dec+0x1ec)
         sp = 0xc05cb880  fp = 0xc05cb898
db_hex2dec() at db_hex2dec+0x1ec
         pc = 0xc001a028  lr = 0xc0019c74 (db_command_loop+0x2c0)
         sp = 0xc05cb8a0  fp = 0xc05cb940
         r4 = 0x00000001  r5 = 0x00000000
         r6 = 0xc02a1607 r10 = 0xc037ad84

yamori813

% strings -t d wzr2g300n_155 | grep start
    156 start
 509264 start
% tail -c+157 wzr2g300n_155 > kernel.org
% ./buffalo-enc -d -i firmware.org  -o firmwre.bin
Magic       : 'start'
Seed        : 0x6e
Product     : 'WZR2-G300N'
Version     : '1.55'
Data len    : 509069

yamori813

RT3052 # md b0110000
b0110000: 00000000 7fffffff ffc86e5a 00000014    ........Zn......
b0110010: 0f000000 00005555 03030303 0000016b    ....UU......k...
b0110020: 00000000 00000004 00000000 00000000    ................
b0110030: 00000000 00080000 00003098 2d3b923c    .........0..<.;-
b0110040: 00001001 00001001 00001001 00000001    ................
b0110050: 00002001 00004003 00006005 00008007    . ...@...`......
b0110060: 0000a009 0000c00b 0000e00d 0001000f    ................
b0110070: ffffffff ffffffff ffffffff ffffffff    ................
b0110080: 00000000 00000000 00000000 027f7f7f    ................

yamori813

Starting kernel ...

CPU platform: Atheros AR7161 rev 2
CPU Frequency=680 MHz
CPU DDR Frequency=340 MHz
CPU AHB Frequency=170 MHz
platform frequency: 680 MHz
CPU reference clock: 40 MHz
CPU MDIO clock: 40 MHz
arguments: 

yamori813

void setup() {
  pinMode(9, OUTPUT);
}
 
void loop() {
  digitalWrite(9, HIGH);   // set the LED on
  delay(1000);              // wait for a second
  digitalWrite(9, LOW);    // set the LED off
  delay(1000);              // wait for a second
}

yamori813

https://wikidevi.com/wiki/Netgear_CG3000D

https://research.kudelskisecurity.com/2017/01/06/do-not-create-a-backdoor-use-your-providers-one/

https://w00tsec.blogspot.com/2013/11/unpacking-firmware-images-from-cable.html