# CB2 Motherboard needed! **URL:** \ **Category:** Technical Questions\ **Created:** [October 10, 2022, 11:09am UTC](https://forum.universal-robots.com/t/cb2-motherboard-needed/24314 "2022-10-10T11:09:04Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![vt340](https://avatars.discourse-cdn.com/v4/letter/v/f0a364/32.png) [@vt340](https://forum.universal-robots.com/u/vt340)\ **Post date:** [October 10, 2022, 11:09am UTC](https://forum.universal-robots.com/t/cb2-motherboard-needed/24314/1 "2022-10-10T11:09:04Z")
Hello! I am a media artist from Germany and I work a lot with technology. I got a UR5 CB2 a while ago for little money and want to work now with the robot together with a dance company to create a theatre piece. Unfortunately the motherboard display output fails from time to time thus I cannot work properly with the robot. The official repair would be way to expansive for me. Thats why I am asking if someone has an old motherboard to sell for me? Especially if it was replaced due to empty BIOS battery. The board is not useless, BIOS can be restored. I hope someone can help me out, as the CB2 is not longer supported by the official support. Thanks, Alexander ---
**Author:** ![ww.ng](https://avatars.discourse-cdn.com/v4/letter/w/3ec8ea/32.png) [@ww.ng](https://forum.universal-robots.com/u/ww.ng)\ **Post date:** [February 15, 2023, 8:52am UTC](https://forum.universal-robots.com/t/cb2-motherboard-needed/24314/2 "2023-02-15T08:52:17Z")
Did your problem solve. Download the manual from this link [UR5 not Booting: 2. Digital Input, No Cable - Technical Questions - Universal Robots Forum (universal-robots.com)](https://forum.universal-robots.com/t/ur5-not-booting-2-digital-input-no-cable/24128) ---
**Author:** ![exactec](https://avatars.discourse-cdn.com/v4/letter/e/d6d6ee/32.png) [@exactec](https://forum.universal-robots.com/u/exactec)\ **Post date:** [November 22, 2023, 8:58am UTC](https://forum.universal-robots.com/t/cb2-motherboard-needed/24314/3 "2023-11-22T08:58:01Z")
Hey, we have some CB2 Motherboards. If You still searching, let us know. Matěj Liederhaus EXACTEC ---
**Author:** ![vt340](https://avatars.discourse-cdn.com/v4/letter/v/f0a364/32.png) [@vt340](https://forum.universal-robots.com/u/vt340)\ **Post date:** [November 22, 2023, 1:48pm UTC](https://forum.universal-robots.com/t/cb2-motherboard-needed/24314/4 "2023-11-22T13:48:21Z")
Hi! Yes please contact me via this E-Mail: **[wg51qjan7ly@temp.mailbox.org](mailto:wg51qjan7ly@temp.mailbox.org)** Thank you! ---
**Author:** ![sam.r](https://avatars.discourse-cdn.com/v4/letter/s/839c29/32.png) [@sam.r](https://forum.universal-robots.com/u/sam.r)\ **Post date:** [February 1, 2024, 12:07am UTC](https://forum.universal-robots.com/t/cb2-motherboard-needed/24314/6 "2024-02-01T00:07:55Z")
> [@sam.r](#): > > I am in need of a CB2 motherboard as well. I am in Monterrey. Please let me know if you still have one. Thanks! I am in need of a CB2 motherboard as well. I am in Monterrey. Please let me know if you still have one. Thanks! ---
**Author:** ![efn](https://avatars.discourse-cdn.com/v4/letter/e/35a633/32.png) [@efn](https://forum.universal-robots.com/u/efn)\ **Post date:** [February 1, 2024, 6:42am UTC](https://forum.universal-robots.com/t/cb2-motherboard-needed/24314/7 "2024-02-01T06:42:43Z")
Hello Sam, You can use a CB3 motherboard for CB2. You’ll have to flash a new PolyScope to the USB drive and transfer programs and calibration files from the CF memory card. Your local distributor should be able to help you. 🙂 ---
**Author:** ![j.fowler](https://avatars.discourse-cdn.com/v4/letter/j/b5a626/32.png) [@j.fowler](https://forum.universal-robots.com/u/j.fowler)\ **Post date:** [August 30, 2024, 10:04am UTC](https://forum.universal-robots.com/t/cb2-motherboard-needed/24314/8 "2024-08-30T10:04:09Z")
Hi efn, Did you manage this? I have attempted upgrading our original CB2 motherboard with a fresh CB3.1 motherboard but having a fault C201A1: Setup of safety control board failed when trying to power up/initialise the arm ---
**Author:** ![efn](https://avatars.discourse-cdn.com/v4/letter/e/35a633/32.png) [@efn](https://forum.universal-robots.com/u/efn)\ **Post date:** [September 3, 2024, 5:22am UTC](https://forum.universal-robots.com/t/cb2-motherboard-needed/24314/9 "2024-09-03T05:22:27Z")
Yes, I’ve done it many, many times. 🙂 It sounds like you’re using PolyScope 3.X for your CB2 robot. You will need to flash PolyScope 1.8 to the USB memory. ---
**Author:** ![j.fowler](https://avatars.discourse-cdn.com/v4/letter/j/b5a626/32.png) [@j.fowler](https://forum.universal-robots.com/u/j.fowler)\ **Post date:** [September 3, 2024, 12:28pm UTC](https://forum.universal-robots.com/t/cb2-motherboard-needed/24314/10 "2024-09-03T12:28:38Z")
Thank you - yes this is likely the case! I did manage to get the old motherboard working again following a “Fix CB2/2.0 - controller that won’t turn on” guide where you replace the 3v battery with a new one and short a couple of pins to get it to boot. It says its a permanent fix but seems once powered down, even with a fresh battery in there is needs the pins shorted and BIOS settings restored ---
**Author:** ![jeuk](https://avatars.discourse-cdn.com/v4/letter/j/e47c2d/32.png) [@jeuk](https://forum.universal-robots.com/u/jeuk)\ **Post date:** [May 22, 2025, 8:46pm UTC](https://forum.universal-robots.com/t/cb2-motherboard-needed/24314/11 "2025-05-22T20:46:53Z")
Hi, please, please contact me via this Mailadress: [fuchser-matthias@web.de](mailto:fuchser-matthias@web.de) thank you