Force update???

I just recently started using my AirPods again after quite awhile of not using them. Needless to say, my left AirPod isn’t working which happened last time I went awhile without using them and therefore they were not updating. I had talked to someone with support back then and they gave me a list of steps to force update but for the life of me I cannot remember how to do it.

If anyone has any idea, I’d be appreciative!

They’re Gen 2. Current firmware is 6A326.