Hi folks, not sure if this is the right place but so please lmk if there is a better place to put this:
I’m currently attempting to reverse engineer yealink t41p IP phone firmware since the device is out of support for some years and but works very well imo. For security reasons and keeping the devices out of the trash, I would like to provide open source firmware for it. I recently learned how the process with clean room reversing works but I’m stumbling at the first step already. Here is what I attempted so far:
haui@TowerPC:~/Downloads/t41p-firmware$ binwalk T41-36.83.0.160.rom
DECIMAL HEXADECIMAL DESCRIPTION
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haui@TowerPC:~/Downloads/t41p-firmware$ binwalk --signature T41-36.83.0.160.rom
DECIMAL HEXADECIMAL DESCRIPTION
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haui@TowerPC:~/Downloads/t41p-firmware$ binwalk -E T41-36.83.0.160.rom
DECIMAL HEXADECIMAL ENTROPY
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16384 0x4000 Rising entropy edge (0.984980)
20480 0x5000 Falling entropy edge (0.783278)
32768 0x8000 Rising entropy edge (0.992664)
45056 0xB000 Falling entropy edge (0.601562)
65536 0x10000 Rising entropy edge (0.991434)
815104 0xC7000 Rising entropy edge (0.992069)
2945024 0x2CF000 Falling entropy edge (0.668870)
2949120 0x2D0000 Rising entropy edge (0.993514)
8155136 0x7C7000 Falling entropy edge (0.843171)
haui@TowerPC:~/Downloads/t41p-firmware$ binwalk -BE T41-36.83.0.160.rom
DECIMAL HEXADECIMAL DESCRIPTION
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DECIMAL HEXADECIMAL ENTROPY
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16384 0x4000 Rising entropy edge (0.984980)
20480 0x5000 Falling entropy edge (0.783278)
32768 0x8000 Rising entropy edge (0.992664)
45056 0xB000 Falling entropy edge (0.601562)
65536 0x10000 Rising entropy edge (0.991434)
815104 0xC7000 Rising entropy edge (0.992069)
2945024 0x2CF000 Falling entropy edge (0.668870)
2949120 0x2D0000 Rising entropy edge (0.993514)
8155136 0x7C7000 Falling entropy edge (0.843171)
haui@TowerPC:~/Downloads/t41p-firmware$ binwalk -y T41-36.83.0.160.rom
haui@TowerPC:~/Downloads/t41p-firmware$ binwalk -e T41-36.83.0.160.rom
DECIMAL HEXADECIMAL DESCRIPTION
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haui@TowerPC:~/Downloads/t41p-firmware$ binwalk -I T41-36.83.0.160.rom
DECIMAL HEXADECIMAL DESCRIPTION
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12622 0x314E BFF volume entry, AIXv3, file name: "iX2jÅ
haui@TowerPC:~/Downloads/t41p-firmware$ binw^C
haui@TowerPC:~/Downloads/t41p-firmware$ binwalk -G T41-36.83.0.160.rom
DECIMAL HEXADECIMAL DESCRIPTION
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