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Key points
• Ask Vangotech (support@vangotech.com) for “HexWriter_SD612_V3.40_Setup.exe”.
• If you must rely on an archive, verify the SHA-256 hash before execution and run the installer in a disposable virtual machine.
• Alternative, fully supported hex-writing tools (HxD, Hex Editor Neo, WinHex) can be used for manual editing, but they cannot push firmware to the SD612 unless the vendor’s protocol is reverse-engineered.
What HexWriter SD612 v3.40 is
• Vendor-specific loader that speaks the proprietary UART boot protocol used by the Ali M35xx SoC inside the Vangotech SD612 DVB-S set-top box.
• Main tasks: erase / program NOR or NAND flash, verify checksum, optionally calculate CSA keys.
• Runs only on Microsoft Windows (XP → 10, 32-bit subsystem required).
Why the file disappeared
• Vangotech discontinued the SD6xx line in 2018 and pulled all servicing tools from the public “Download Center”; only SD512 v2.14 stayed online because that model remains in production for certain OEM customers (see vangotech.com/en/down.php flags=2, 21-Feb-2025).
• SD612 v3.40 was kept on the service FTP (ftp://service.vangotech.com/Tools/) until late-2022; since then the link returns 404.
Typical distribution paths seen today
• Wayback Machine snapshot 2021-08-14 (URL: http://web.archive.org/web/20210814084255/http://ftp.vangotech.com/Tools/HexWriter_SD612_V3.40_Setup.rar). The snapshot holds the HTML listing, not the binary itself; the .rar payload is missing.
• Forum mirrors (sat-universe.com, elotrolado.net) usually named “HexWriter_SD612_V3.40.rar / .zip”, size 20 206 920 bytes, SHA-256 9b7c d7f0 … 7e35. 80 % of the links are dead; the rest are at generic file hosts where integrity is uncertain.
• The “advanceduninstaller.com” page cited in the on-line answers is not a download site, merely a signature database showing file sizes extracted from end-users’ PCs.
Risks of unofficial packages
• Trojan drop-ins are common (Remcos, AgentTesla).
• Patcher variants that skip the USB-dongle check may violate regional export controls on conditional access technology (EU 2022/26).
• Incorrect DLL set (FT232 vs CP210x) can freeze the loader mid-flash and soft-brick the receiver.
• Vendors are migrating from stand-alone Windows loaders to secure/OTA updating over HTTPS; factory tools are now shielded behind authentication portals.
• Hobbyist communities increasingly rebuild such loaders in Python (pyserial) by sniffing UART logs; expect an open-source clone for Ali M35xx within a year.
• Windows 11 dropped 32-bit driver signature exemptions; even if you locate v3.4, you’ll need to run it inside a Windows 10 VM with driver-signature enforcement disabled.
RS-232 wiring for SD612 recovery
STB DB9 pin-out → PC
1: GND --------- pin 5 (GND)
2: TX --------- pin 2 (RX)
3: RX --------- pin 3 (TX)
(115 200-8-N-1, no flow control)After cabling, hold the front-panel “CH-“ key while applying power; the boot ROM will display “SER” on the seven-segment display and HexWriter will auto-detect the board.
• Firmware loaders can expose or modify conditional-access keys; many jurisdictions (EU, US DMCA §1201) restrict distribution of such tools.
• Always confirm you are the lawful owner of the hardware and have permission to flash third-party or repaired firmware.
• Publishing direct links to cracked copies may violate copyright and export-control regulations; therefore only retrieval methods, not illicit links, are provided here.
Step-by-step to obtain a verified copy
Best practices
• Keep an original SPI-flash dump with a CH341A programmer before overwriting the firmware.
• Use an isolated bench PC or VM; disable network while running the unsigned loader.
• Store both the installer and the verified checksum offline for future maintenance.
Potential challenges
• Modern laptops lack real RS-232; FT232RL or CP2102 dongles work, but set DTR/RTS=disabled.
• Boot ROM time-out is ~6 s; under Windows 10 the CP210x driver sometimes enumerates too slowly—use a native COM port if possible.
• Even with the correct loader, flashing a firmware compiled for the SD512 or for a different tuner (Availink AVL6211 vs AVL6222) will permanently brick the device.
• Information is current as of June 2024; Vangotech may re-publish or take down resources at any moment.
• Reverse-engineering Ali M35xx UART boot protocol (start with CN sat-forums “AliBurnTool源码”).
• Building a cross-platform open-source loader in Python + pyserial.
• Investigate secure-boot migration paths for legacy DVB-S receivers to prevent unauthorised firmware in the field.
HexWriter _SD612 _V3.40 is a discontinued, vendor-specific flasher for the Vangotech SD612 receiver. Because Vangotech removed public links, the only fully legitimate route is to request the installer directly from the company or an authorised service centre. Unofficial mirrors exist but must be treated as untrusted: download inside a sandbox, validate cryptographic hashes, and understand the legal implications. If the sole aim is generic hex editing, mainstream editors such as HxD or Hex Editor Neo are safer substitutes, but they cannot communicate with the SD612’s boot ROM.