Can I update roland Juno G Old version to new?

https://www.roland.com/uk/products/juno-ds/
https://www.sweetwater.com/store/detail/JunoDS61--roland-juno-ds61-61-key-synthesizer/reviews
https://www.sweetwater.com/store/detail/JunoDS61--roland-juno-ds61-61-key-synthesizer/reviews
https://www.rolandus.com/blog/tag/juno-di/
https://www.amazon.com/Roland-Lightweight-Weighted-action-Keyboard-JUNO-DS61/dp/B016NUAL5Y

The information is in the manual. You can download a copy here-
JUNO Owner Manual JUNO Manuals Support Roland

Roland Juno gi program error problem

You install the expansion card to the bottom side of the Juno by removing screws. For detailed step by step instructions, I suggest that you refer to page 174 from the manual that you can download from: JUNO-G Owners Manual (JUNO-G_OM.pdf)

If you have the version 1 cable you need to download a driver. The details are at this link:http://www.cme-pro.com/en/news-detail.php?news_id=105

This is probably normal. The sound generators need to re-configure when changing voices. This means that while one set is generating the old voice, others have to be set to the new and the old cancelled. The sound has to be muted between the setting changes... this takes a fraction of a second to do in the hardware. The only solution is to use two synths and have each set to the sounds you want. MANY musicians rack up two synths just for this purpose.

If you have the new Juno here is a link to their update:http://www.rolandus.com/products/productdetails.php?ProductId=429 Also try looking in your manual for the initialisation procedure. This will return your keyboard to the factory settings .

juno, lovely instrument, try the synthesizer repair centre in london

i think you need new membranes, they are hard to fix.

Normally you have to clean the conductive rubber "pills" AND the circuit board traces they get pressed down on.

USE ONLY 99% isoprophyl alcohol on Q-Tips to do the cleaning and be gentle.

Use of other product like deoxit and other contact cleaners will wreck the contact material.