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We released new firmware upgrade for INCH familly that introduced same platform for all INCH products, including INCH Pro, INCH HOME and INCH DUO. We decided to make firmware releases more uniform, and easier for our customers.

At the moment new firmware is still RC state, meaning it is meant for testing. RC version is 3.900.

If you would like to test with RC version you can write to us at

We have split upgrade on two parts, system and app image, and while upgrading app image with raise minor version e.g. 4.1 → 4.2, every system upgrade there will be new major version upgrade e.g. 4.x to 5.x.

New releases will now be published under new section ​Etrel INCH Firmware on our ​Etrel knowledge base , and will include changelogs and latest firmware releases, while older ones will still be available under standard sections for every INCH model.

We are currently producing INCH chargers with both 1.13.9 and 3.0.1 version, but we will move forward with 4.x only for all INCH products.

To check if your new station is old version you can go to web interface and check firmware version under Diagnostics submenu. Other obvious change is new menu when holding reset button for few seconds.

Version 1.13.9

Version 3.X onwards

Firmware roadmap

Our firmware releases roadmap currently looks like this. We are still producing both INCH PRO / HOME with 1.13.9 and 3.0.1, while DUO is now on 3.0.1. With next stable release, firmware version will be 4.x and with future system image updates major version will increase by one, and with new app relelases minor versions will go up.

Limitations with INCH

Currently we only support upgrading INCH chargers to 4.x with serial greater than 19420xxx. For older stations we will provide support in the future

Upgrading Inch

Upgrading INCH from version 1.x to 4.x is two step process. In first step we are upgrading system image, with newer version. In second step we will update application.

Upgrading system image

After successfull step one, you can connect to your charger and in event logs you will see following line if step one was successfull

Then proced to step two. Upload new firmware and you should see this screen

Second phase of upgrade can take quite a while, and after successfull upgrade station should reboot itself. If that doesn’t happen, then you reboot it manualy with disconecting power source.

Stations with firmware 3.x and newer

Stations using firmware 3.x and newer can be upgraded to newer versions normally without using any special tools.

Upgrading INCH DUO

If your DUO uses version 2.x it can be easily upgraded to firmware version 3.x, and upgrading to newer firmwares, same as for INCH units on 3.x, uses standard procedure. For future releases it will be same as standard INCH chargers, with every system update major version will go up, and with every app update minor version will go up.

CAUTION: if the charging station uses a mobile connection, please check how much data you have leased in the package. Upgrade file size is aprox 78 MB. If you have less data available in the package, we recommend a local upgrade otherwise additional costs may be incurred by your mobile provider!