If you want to upgrade your set-top box software by PC or if you have broken STB which you want to recover by RS-232 cable then this post is for you. This post is about only RS-232 cable, if you want how to upgrade then click here. For upgrading the set-top box by PC, an RS-232 cable is the most important accessory. Nowadays in all PC DB9 pin serial male ports are easily available so you need female-to-female DB9 / RS-232 cable. In the market, it is easy to available DB9 modem cable but sometimes not easy to avail RS232 cable, Both cables look the same, same connector and plugs. Which Cable is required for the STB or TV Firmware Upgrade? What to do when RS 232 Port is not available?: If this port is not available on your PC then you can use a USB to RS 232 converter cable, it is easily available on all online stores like eBay, Amazon, MarginPrice, etc. You have to install software to convert the USB port to a serial port. If you receive the wrong DB9 cable then you can check the pin as given below picture. If the pins are different then cut your cable and configure it as below picture. Pins should be connecting order is vice-versa as below:
  • pin2-pin3
  • pin3-pin2
  • pin5-pin5
Set-Top Box upgrades by RS-232 Cable using loader software. Check rs232 cable specification, use rs232 cable to USB cable, set-top box flash tool   You can upgrade by rs232 cable, if you are looking for rs-232 cable specification then it is a simple Cable. currently lots of RS232 Cable available in market like DB9 to DB9, Printer Cable, USB to RS-232 Cable, etc. If you are using USB to serial cable then it requires a serial cable receiver software, also called a set-top box flash tool.

Where to Buy?

It is easily available on Amazon and other websites. you can buy from Amazon.  
  FAQs –

How to change set-top box software.

You can change set-top box firmware using RS232 Cable, Update by USB, Upgrade Online, Upgrade by Satellite, etc.

What type of cable is used for RS-232?

You can use an RS-232 Serial cable.

What is RS-232 used for on TV?

You can use USB to Serial cable to upgrade the firmware of the TV or Set-Top Box.

What cable is used for serial communication?

DB9 Cross Connection, Printer cable, RS–232 to USB cable used for serial communication. I hope you understand about R.S.232 cable, If you want to know how to upgrade your PC – Click Here  

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Set-Top Box, Tools