Demo firmware commonly available has rates fixed to 10ct for a 10/11 digit call and 25ct for 7-digit local call. To edit the advertising messages or speed dial buttons you need a hex editor and some experience. It also has several bugs, like some coins not being detected properly (a nickel recognized randomly as 5 or 6 cents, a dollar coin - 9 cents) etc.

We just released a demo firmware editor so you can customize it online, then download your .bin file.

Important notes:

• Demo firmware only works with MTR 1 boards. Compare your board with the picture below.
• Service is free but please limit EPROM downloads to two each day
• I put a lot of effort developing this tool. You can buy me a coffee ($3 - $5) if you find this service useful (link leads to Paypal)
• Programmed chips ready to be installed available on ebay for $25 shipped.
• Remember your code when done, so you can recall and correct it later or use for ordering the chip.
• Service provided as-is with no guarantees. Use at your own responsibility.
• Known issues:
  • as of Aug 2025, this was mostly tested with no major issues, but we're awaiting your feedback.
  • French translation - although correct (based on original firmware), voice prompts are sometimes incorrect. Needs more research. Also you need a correct voice chip.
  • Formatting the ad texts is a bit of a challenge.

Enter here: demo firmware editor

MTR1 type board:


Latest updates:
05/20/2025 Initial release
05/26/2025 0.9
Fixed:
- option “Display called number” not working
- some French translation not finished

06/06/2025 1.0 *First official release*
Fixed:minor bug improvements
- handling ad messages not filled up with spaces
- default config loaded incorrectly

07/07/2025 1.01 Minor improvements & bug fixes:
- correct voice prompts for French amounts 35¢ to 85¢
- Local NPA tables 65-67: Zero the NXX tables, some NXX numbers had different rating
- Correct translation of | Free Tel | to: | Gracias por usar | and | Merci de choisir |

07/27/2025 1.02 Minor improvements & bug fixes:
- Correct “ads enable” option not working, always on
- Expand local NPA list to 7

08/08/2025 1.1 Improvements and bug fixes
- Fixed LD rate structure (table 0x40) - overtime was wrong in some cases
- Added option: disable ringer
- Added option: broad range of magnetic cards