I’m posting to help my Grandmother. She has very poor hearing (completely deaf in one ear and very poor hearing in the other). She’s had multiple hearing aids over the years, but the only one that has really worked for her is a Phonak Bolero, which was given to her after a death in the family. A local audiologist boosted it to the maximum volume. It still isn’t strong enough, but it’s still way better than the others.
Unfortunately it stopped working. I thought about buying her another one online. The only problem is that the previous audiologist retired and the other ones in my small town aren’t particularly helpful. If I decide to buy one, is there a way for me to boost the volume to the maximum level myself? If so, what is involved?