AchilleΣ PLUS – Tuning for the Eachine PRO58 Module



Although I have participated in this project, I have no advantages or revenue! I support George free of charge in his great project!

The Eachine PRO58 module

The name Eachine does not stand for producing high quality products for the FPV scene. He also likes to look here and there with other manufacturers. But this module is unlike any other module on the market. The quality of workmanship is, as usual, „china low-cost“, but here, too, it sometimes comes down to the inner values.

Unlike all other available modules on the market, this module uses an STMF1 processor known from previous flight controllers. This chip can run at up to 128MHz, while the other modules mostly use an ATMEGA chip and shut down at 16Mhz. Currently, the Eachine PRO58 is just running at 72MHz.

Although this module works with the standard Eachine software, it is far away from good software. At this point, the AchilleΣ PLUS firmware comes into the game. George, a Greek programmer, has spent months writing the code for this module from scratch. I would argue that the extremely cheap Eachine PRO58 module, along with the code developed by George, is currently one of the best modules on the market.

Here is a small video through the menu: (BTW: My wheel is unfortunately broken, so I scroll in the video only in one direction, which has nothing to do with the software) 😉 Thank you Benni for the module!


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  • OSD (On Screen Display)
  • Lap Timer to measure lap times
  • 620 „channels“ (covering virtually the entire 5.8 GHz band)
  • Manual channel search
  • 10 freely assignable favorites
  • Band scanner
  • Modell-finder
  • „ULTRA Search“
  • „EVENT Mode“
  • „FAST Mode“
  • „Kerveros Mode“

Buy license

The license costs only 11€ once. It is specially compiled based on the serial number of the receiver module and then sent to the buyer.
Updates are free for life!

You can buy a license here

OSD (On Screen Display)

When delivered, the Eachine PRO58 has no OSD. But George found a way to implement an OSD in the software. This makes it possible to keep the glasses on during a channel change. Furthermore, all other functions which are otherwise displayed via the OLED display can be executed via OSD. Once the OSD is switched, the video picture turns off and turns black. At the moment it is not yet possible to see the OSD during the flight ….. not yet …. 🙂

OSD 2.0

I can not say much yet, but together with George, I have designed something that will please you when it works!


Lap Timer

The lap timer makes it possible to measure lap times. All you need is a patch antenna on port B (the bottom one), which is best aligned with the start / finish gate. Ideally you should sit about 3-5m next to the start / finish gate.
Please pay attention to sufficient protection such as through a web!



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ULTRA Search

This is the auto-search mode. In this case, the relevant frequency is scanned in a fraction of a second with up to 5000 RSSI read operations.
Another feature in this mode is the Auto Tune feature. If, due to a wrong antenna or local conditions, a particular channel happens to be better or worse at +-2Mhz, the module will scan again and if necessary set a custom channel which visually identifies it.
Example: If Raceband 7 (normally 5880) produces a better RSSI value on 5882 then this is selected as the new Raceband 7 channel.

Manuel channel search

As with all other modules, this mode also allows you to switch channel by channel and create favorites by pressing and holding the wheel on the desired channel.
Incidentally, in Ultra, Fast and Event Mode favorites can also be saved in this way.

EVENT mode

This mode is preferably for events. It scans the entire 5.8GHz band in just 2.5 seconds and stores all the channels currently in use. Then you can switch back and forth between these channels. In this way it is possible to quickly find the channels on which the other guys are flying.

FAST mode

This is a mode between Ultra Search and Manual Mode. It should be possible to switch relatively quickly to the desired frequency.


Up to 10 channels can be saved as favorites. Via the menu „Favorites“ you reaches the previously saved channels and you can switch them through.

Band scanner

The band scanner works like a classic scanner, which scans and graphs the complete 5.8GHz band. As soon as you press up or down, it will do a „deep scan“ in the range of + -6Mhz

Model Finder

The model finder function makes it possible to recover crashed quads. All you have to do is screw a patch antenna onto the antenna connector B and point it in the direction the quad might have crashed. The display and the beeper will lead you to your copter. 🙂

Kerveros mode

The Kerveros mode (derived from a Greek myth of multi-headed dog) is quite a complex mode, but I still try to explain it.

The receivers RX1 and RX2 work independently of each other and the CPU controls this, depending on which receiver has a better RSSI value.
The RX1 receiver (port A) always receives on the frequency of the tuned channel. RX2 (port B) compares the adjusted channel to + -1MHz in this mode and determines RX2, which is best for him. Then the diversity between RX1 and RX2 decides again to find the better value.

Example of Raceband 7 channel:
RX1 works at 5880MHz
RX2 decides between 5879MHz, 5880MHz and 5881MHz
The diversity now either changes between 5880MHz and 5879MHz or 5880MHz and 5881MHz

In this way, an attempt is made to receive the very best signal, for example if an antenna is damaged or the local conditions influence the signal.

Flash module

Below I show you how the firmware is flashed on the module. At this point I would like to thank Benni Hörner, who contributed to this tutorial.

What you need

Connect the module

Flash firmware

Upload the firmware using the STM32 ST-LINK utility 

Read out serial number

After the program has finished uploading, the module will be turned on and you will receive your serial number. During the purchase process you will be asked for this number.
Upon successful payment, you will receive the firmware within 24 hours.
Just upload the firmware like the other one, and then your module will be unlocked.

Modify module

In order to use the OSD function, you need to do the following modification



This is how the module should look like

Then only set „Enable OSD“ to „on“ in the settings


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Wenn dir dieser Artikel gefallen hat und du mich unterstützen möchtest, findest du hier ein paar Möglichkeiten. DANKE!
If you liked this article and would like to support me, here are a few options. THANK YOU!

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