$ smbusb_comm -a 16 -c 71 -w 0x0214 $ smbusb_scan -w 0x16 -b 0x70 ------------------------------------ smbusb_scan ------------------------------------ SMBusb Firmware Version: 1.0.0 Scanning for command writability. Scan range: 70 - ff Skipping: None ------------------------------------ [71] ACK, Byte writable, Word writable [72] ACK [73] ACK So this actually unlocks an extra command which disappears again when an SBS command is issued (or when doing a full command scan starting from 0.) The command however is not writable.
How to fix isdonedll error while installing the game. Reading it returns. Ok, nothing straightforward.
How to factory reset sanyo dp39843 flat tv. To do a hard reset, just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. This procedure will make it a hard reset. If you want to make it a system reset [Factory Reset]; you have to enter its service mode option, and select the factory reset.
No obvious BOOT pin as one would expect with a device that's not meant to be tampered with. But maybe pulling some pin high or low during reset will get me somewhere. After the first pass no, not really.
So maybe we have to set multiple pins into multiple states for it to work. Or maybe there's no such combination at all.
How about I try to abuse N/C pins instead. I have no logical explanation as to why I came to this decision.
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Maybe I saw a presentation somewhere about blackbox chips and N/C pins years and years and years ago but I could just be imagining things. Either way, about 5 minutes of poking at PIN #28 with a resistor connected to 3.3v in hand and triggering RESET at random intervals while running a continuous command scan. $ smbusb_scan -w 0x16 ------------------------------------ smbusb_scan ------------------------------------ SMBusb Firmware Version: 1.0.1 Scanning for command writability. Scan range: 00 - ff Skipping: None ------------------------------------ [0] ACK, Byte writable, Word writable, Block writable [1] ACK [2] ACK [3] ACK [4] ACK, Byte writable, Word writable, Block writable [5] ACK, Byte writable, Word writable, Block writable [6] ACK, Byte writable, Word writable [7] ACK, Byte writable, Word writable [8] ACK [9] ACK, Byte writable, Word writable [a] ACK, Byte writable, Word writable Wow, that worked? Let's just reset for now. $ smbusb_sbsreport SMBusb Firmware Version: 1.0.1 ------------------------------------------------- Manufacturer Name: ERROR Device Name: ERROR Device Chemistry: ERROR Serial Number: Manufacture Date: 1980.00.00 Uh-oh. Well that's not good!
It seems we're stuck in the Boot ROM. Is the chip fried? It's at this point that I coded up the flash tool to try and read the flash contents.