AirPods Pro 1. Few bass frequencies after upgrade to 5e135

Hi M095,

Thank you for participating in the Apple Support Communities. We understand your AirPods have less bass frequencies since the firmware update. We recommend testing them with multiple apps and devices to help isolate the issue. You may even consider cleaning them to make sure no debris is blocking the speakers. Here's how if needed: How to clean your AirPods, AirPods Pro, AirPods Max, and EarPods - Apple Support.

"Learn how to clean your AirPods, AirPods Pro, AirPods Max, and EarPods. 

Is it OK to use a disinfectant on my AirPods, AirPods Pro, AirPods Max, or EarPods?

Using a 70 percent isopropyl alcohol wipe, 75 percent ethyl alcohol wipe, or Clorox Disinfecting Wipes, you may gently wipe the exterior surfaces of your AirPods, AirPods Pro, AirPods Max, or EarPods. Don’t use on the speaker mesh of your AirPods, AirPods Pro, and EarPods. Don’t use on the knit mesh canopy and ear cushions of your AirPods Max. Don't use products containing bleach or hydrogen peroxide. Avoid getting moisture in any openings, and don’t submerge your AirPods, AirPods Pro, AirPods Max, or EarPods in any cleaning agents.

Clean your AirPods and AirPods Pro

• Don’t run AirPods or AirPods Pro under water.
• Use a soft, dry, lint-free cloth.
• If your AirPods or AirPods Pro are exposed to anything that might cause stains or other damage—for example, soaps, shampoos, conditioners, lotions, perfumes, solvents, detergent, acids or acidic foods, insect repellent, sunscreen, oil, or hair dye:
  • Wipe them clean with a cloth slightly dampened with fresh water and dry with a soft, dry, lint-free cloth.
  • Allow them to completely dry before placing in the charging case.
  • Don't attempt to use them until they're completely dry.
• Make sure not to get any liquid in the openings.
• Clean the microphone and speaker meshes with a dry cotton swab.
• Don't use sharp objects or abrasive materials to clean your AirPods or AirPods Pro.

Clean the case of your AirPods or AirPods Pro

Clean the charging case with a soft, dry, lint-free cloth. If necessary, you can slightly dampen the cloth with isopropyl alcohol. Allow the charging case to dry. Make sure not to get any liquid in the charging ports. Here are a few more guidelines:

• Remove any debris from the Lightning connector with a clean, dry, soft-bristled brush.
• Don't use abrasive materials to clean the charging case.
• To avoid damaging the metal contacts, don't put anything in the charging ports.

Clean the ear tips of your AirPods Pro

1. If any water has accumulated in the ear tip, tap the AirPod on a soft, dry, lint-free cloth with the ear tip opening facing downward to remove.
2. Pull off the ear tips from each AirPod and rinse the ear tips with water. Don't use soap or other household cleaners.
3. Wipe the ear tips with a soft, dry, lint-free cloth. Make sure that the ear tips are completely dry before reattaching to each AirPod.
4. Click the ear tips back on each AirPod. The ear tips are oval shaped, so make sure that you align them before you click them back on."

Take care.

Hello M095,

Thanks for the followup. Given the troubleshooting already completed, we suggest that you contact Apple Support so that they can look into this with you further and provide service options if necessary.

They can be reached by following this link: Get Support

Have a great day.