Thank you so much for the help. The 851 is on its way. I am going to be using it in the shop to keep it above freezing temp this winter to. I already had a 3b+ good to know it won't work and get frustrated. The auc 3 converter runs around 30$ from US does that sound right? There are many on ebay from china but I get tired of expecting it to be here in 2 weeks and it takes 3 months or never shows. Any way again thank you for the help on my endeavor.
Why not try to find someone near you who has raspi 3 and swap it with your 3b+? You can maybe find someone in your area(I'm just suggesting if you don't want to spend).
$30 for AUC3 is pretty expensive Zeusbtc is selling this for around $6 but the problem is minimum order must be 10.
However, you can try to contact them maybe they will give an exemption. Here's the link
https://www.zeusbtc.com/ASIC-Miner-Repair/Parts-Tools-Details.asp?ID=303I think I found it to whoever this may help in the future. This looks like its for all the downloads. If someone knows where to pin this for someone else that would be great. Nothing came up for a search for me on the forum.
https://download.canaan-creative.com/No, you don't need to pin it because it's already on the Canaan support page under the firmware page.