My 5d mark 11 camera screen appears error20 and it wont remove

If this happens with different lenses then I think you've got a repair job on your hand. If it only happens with one particular lens then it may be the lens.

PDF]PDF QuickGuide to EOS Live View Features

https://www.learn.usa.canon.com/.../CDLC_EOSLiveView_Q...

Canon Inc.Canon EOS cameras when used in their Live View mode. ... directly onto the sensor, which in turn displays the image ... EOS 40D, 5D Mark II, EOS-1D Mark III, EOS-1Ds Mark III, ... Mark III do not offer movie options. ... to produce a fixed screenbrightness, or Exposure .... settings for the following camera menu options:.

Canon Knowledge Center - Changing the AF Mode to Use ...

https://support.usa.canon.com/kb/index?page=content&id=ART134415

Nov 4, 2015 - ID : 8201360200 _ EN _ 1. Solution ... While the Live View image isdisplayed, you can press the < AF?????????DRIVE &gt; button to select the AF mode on the setting screen displayed. 9. ... If focus is not achieved, the AF point will turn orange. .... Shooting movies with the default settings (EOS 5D Mark III)

On the 5D error code 30 appears to be shutter related and general advice is to get a professional repair or send it back to Canon.

I was able to download the manual from Canon USA for free. I could search the page for you, but perhaps you also want the manual and read it yourself? here is the link to the download page:
EOS 5D Mark III

If it's just the display window, then about 19USD.
http://uscamera.com/cb3-2864.htm

Follow the correct instructions below based on the diagram to change the language of Canon EOS 5D Mark II from Japanese to English;

1.Press the MENU button.Different tabs are displayed on top of the screen as shown below.


2.Turn the Main Dial to select the Setup Tab ( The one with two dots and a spanner) on top of the screen.
3.Under this tab Turn the Quick Control Dial to select [Language] ( the third item from the top ) and press the SET button.

4.To select the desired language use Main Dial or Quick Control Dial (The current setting is indicated in Blue) and Press the SET button.
5.The desired language is set.

Thanks for choosing Fixya

No. It's simply a menu setting to show you where potentially overexposed highlights in the final image will be. The function can be set to show shadows or highlights.

I don't currently have a manual to hand, but if you can't find how to turn it off in your own manual then report back and I'll have a thorough rummage for one.

Cannon lp-e6 battery fit canon eos 5d mark ii http://www.canon-digital-camera-battery.co.uk/batteries/canon-lp-e6.htm

Download the current Adobe Camera Raw (ACR) from Adobe.

Google the words...disassemble a digital camera.