# Upgraded to 1.2.1 - Messed up controller and probing

**URL:** <https://forum.onefinitycnc.com/t/upgraded-to-1-2-1-messed-up-controller-and-probing/21396>\
**Category:** Troubleshooting (X35/X50)\
**Created:** [July 11, 2023, 6:39pm UTC](https://forum.onefinitycnc.com/t/upgraded-to-1-2-1-messed-up-controller-and-probing/21396 "2023-07-11T18:39:15Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![349iq2345](https://avatars.discourse-cdn.com/v4/letter/3/bb73d2/32.png) [@349iq2345](https://forum.onefinitycnc.com/u/349iq2345)\
**Post date:** [July 11, 2023, 7:53pm UTC](https://forum.onefinitycnc.com/t/upgraded-to-1-2-1-messed-up-controller-and-probing/21396/8 "2023-07-11T19:53:14Z")

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Hey FeasterFamine,

> [@FeasterFamine](#):
>
> I have been reading various posts on this forum for about an hour and my brain is starting to fizzle out. There are problems with 1.2.1? There aren’t problems with 1.2.1? Some users have to flash their SD? But it seems you have to know what versions you have ever had (which I do not)? But only advanced users should do that? Some users can “return” to a prior version, but I have no apparent option to do so?
> 
> Where do I start?

Your buildbotics-derived Onefinity CNC controller comes with firmware that you can use. If you connect it to a network that has access to the www or if you connect via a remote web browser, you will also have an automatic online version check that will result in a recommended firmware version shown on top of the CONTROL page which suggests to update firmware if necessary (you can disable it [this way](https://forum.onefinitycnc.com/t/everything-works-until-i-hit-play-then-nothing/20468/16) if you want to keep your installed firmware and don’t want to be annoyed by that).

You simply use the firmware that is installed until you have an issue, then you report this issue under [Firmware (Buildbotics) \> $VERSION](https://forum.onefinitycnc.com/c/firmware/firmware-updates/108) or under [Firmware (Buildbotics) \> Latest Firmware](https://forum.onefinitycnc.com/c/firmware/firmware/98) respectively and then you follow the instructions that the developers or support tell you.

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