# Cannot update firmware for Multi-plus 3000 with VE.Bus to USB 3 adapter **URL:** \ **Category:** DIY\ **Tags:** beginner, victronconnect, multiplus\ **Created:** [14 August 2025 13:15 UTC](https://community.victronenergy.com/t/cannot-update-firmware-for-multi-plus-3000-with-ve-bus-to-usb-3-adapter/43221 "2025-08-14T13:15:40Z")\ **Posts on this page:** 12\ **Page:** 1
**Author:** ![woodycooper](https://avatars.discourse-cdn.com/v4/letter/w/7cd45c/32.png) [@woodycooper](https://community.victronenergy.com/u/woodycooper)\ **Post date:** [14 August 2025 13:15 UTC](https://community.victronenergy.com/t/cannot-update-firmware-for-multi-plus-3000-with-ve-bus-to-usb-3-adapter/43221/1 "2025-08-14T13:15:40Z")
I have several problems here. First, when I select my device using the VictronConnect Windows App, it immediately tells me that my firmware is incompatible. I have v408 and I need v415 or higher. I click OK I do see a screen showing input, output, battery voltages and all the other information I’d expect. What I bought this for is so I could correct the settings that as far as I can tell are incorrect in Absorption and Float voltages etc. If I try to enable settings it says I need a password which I can get from training? So, two things: how can I update the firmware? Second, how can I access settings? That’s why I bought this adapter. Thanks for any guidance. ---
**Author:** ![nickdb](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/nickdb/32/51440_2.png) [@nickdb](https://community.victronenergy.com/u/nickdb)\ **Post date:** [14 August 2025 13:30 UTC](https://community.victronenergy.com/t/cannot-update-firmware-for-multi-plus-3000-with-ve-bus-to-usb-3-adapter/43221/2 "2025-08-14T13:30:29Z")
Use veflash and the current firmware file for the unit. Settings need to be reapplied after an update. ---
**Author:** ![woodycooper](https://avatars.discourse-cdn.com/v4/letter/w/7cd45c/32.png) [@woodycooper](https://community.victronenergy.com/u/woodycooper)\ **Post date:** [14 August 2025 15:16 UTC](https://community.victronenergy.com/t/cannot-update-firmware-for-multi-plus-3000-with-ve-bus-to-usb-3-adapter/43221/3 "2025-08-14T15:16:24Z")
When I use VEFlash for Wiindows it just asks me for the file. I’m trying to download from [professional.victronenergy.com](http://professional.victronenergy.com) but the entire site is not responding. ---
**Author:** ![nickdb](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/nickdb/32/51440_2.png) [@nickdb](https://community.victronenergy.com/u/nickdb)\ **Post date:** [14 August 2025 15:22 UTC](https://community.victronenergy.com/t/cannot-update-firmware-for-multi-plus-3000-with-ve-bus-to-usb-3-adapter/43221/4 "2025-08-14T15:22:56Z")
> [@woodycooper](#): > > [professional.victronenergy.com](http://professional.victronenergy.com) Indeed, you need to provide the right file. I just connected to the site fine, firmware all present in the relevant folders. ---
**Author:** ![woodycooper](https://avatars.discourse-cdn.com/v4/letter/w/7cd45c/32.png) [@woodycooper](https://community.victronenergy.com/u/woodycooper)\ **Post date:** [14 August 2025 15:41 UTC](https://community.victronenergy.com/t/cannot-update-firmware-for-multi-plus-3000-with-ve-bus-to-usb-3-adapter/43221/5 "2025-08-14T15:41:59Z")
I see hundreds of files there. I don’t know which one. I see no 7 digit number on the system board, but there are three stickers which all have S/N Product etc but they are much longer. Sorry but I’m unclear which one to use. ---
**Author:** ![woodycooper](https://avatars.discourse-cdn.com/v4/letter/w/7cd45c/32.png) [@woodycooper](https://community.victronenergy.com/u/woodycooper)\ **Post date:** [14 August 2025 15:51 UTC](https://community.victronenergy.com/t/cannot-update-firmware-for-multi-plus-3000-with-ve-bus-to-usb-3-adapter/43221/6 "2025-08-14T15:51:54Z")
VEFlash for windows won’t connect via the com: port I configured, which does work fine for VEConfigure for Windows. I looked for VEFlash for Android because my phone will connect via usb-ve.bus dongle. Can’t find that. My phone connects every time but complains initially about the firmware version being too low and then it displays and I configured the multi-plus just fine in that state. But I feel it would be best to have the latest and greatest updates for this unit. ![IMG_20250814_112152694_HDR](https://europe1.discourse-cdn.com/victron/original/3X/d/5/d5b0ea075e989c3a6c8dc0ce4d2cc763392a0626.jpeg) ---
**Author:** ![firepete](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/firepete/32/32345_2.png) [@firepete](https://community.victronenergy.com/u/firepete)\ **Post date:** [14 August 2025 16:07 UTC](https://community.victronenergy.com/t/cannot-update-firmware-for-multi-plus-3000-with-ve-bus-to-usb-3-adapter/43221/7 "2025-08-14T16:07:48Z")
i did mine today for the first time .i found out i have a very early firmware 142 and computer would not connect .but i updated the usb driver and now it connects ok. but if i try with my phone it says wrong firmware. i think i need to update the firmware to above 200 .i believe my inverter can only upgrade to the 200 firmware any higher will not work . but for now im happy it connects fine on the compute r ---
**Author:** ![woodycooper](https://avatars.discourse-cdn.com/v4/letter/w/7cd45c/32.png) [@woodycooper](https://community.victronenergy.com/u/woodycooper)\ **Post date:** [14 August 2025 16:14 UTC](https://community.victronenergy.com/t/cannot-update-firmware-for-multi-plus-3000-with-ve-bus-to-usb-3-adapter/43221/8 "2025-08-14T16:14:10Z")
I can connect now and it rejects the two files I picked at random. I’m getting closer now I just need to know which is the correct one. ---
**Author:** ![nickdb](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/nickdb/32/51440_2.png) [@nickdb](https://community.victronenergy.com/u/nickdb)\ **Post date:** [14 August 2025 16:23 UTC](https://community.victronenergy.com/t/cannot-update-firmware-for-multi-plus-3000-with-ve-bus-to-usb-3-adapter/43221/9 "2025-08-14T16:23:22Z")
Check the 4 digit hardware ID for the inverter on vrm. That will be a folder under vebus systens. ---
**Author:** ![M\_Lange](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/m_lange/32/16_2.png) [@M\_Lange](https://community.victronenergy.com/u/M_Lange)\ **Post date:** [14 August 2025 16:23 UTC](https://community.victronenergy.com/t/cannot-update-firmware-for-multi-plus-3000-with-ve-bus-to-usb-3-adapter/43221/10 "2025-08-14T16:23:25Z")
There is a bigger chip in the upper left, it has a sticker on it, that’s the number you need. ---
**Author:** ![woodycooper](https://avatars.discourse-cdn.com/v4/letter/w/7cd45c/32.png) [@woodycooper](https://community.victronenergy.com/u/woodycooper)\ **Post date:** [14 August 2025 18:24 UTC](https://community.victronenergy.com/t/cannot-update-firmware-for-multi-plus-3000-with-ve-bus-to-usb-3-adapter/43221/11 "2025-08-14T18:24:47Z")
That got it. Thanks a bunch. ---
**Author:** ![woodycooper](https://avatars.discourse-cdn.com/v4/letter/w/7cd45c/32.png) [@woodycooper](https://community.victronenergy.com/u/woodycooper)\ **Post date:** [14 August 2025 18:26 UTC](https://community.victronenergy.com/t/cannot-update-firmware-for-multi-plus-3000-with-ve-bus-to-usb-3-adapter/43221/12 "2025-08-14T18:26:04Z")
That helped me find the correct one and it installed OK. Thanks a whole lot. This stuff is old and difficult to deal with.