This is probably old news. but I just got this from Amazon. I guess Amazon is really trying to push buying newer firestick versions but getting Netflix to end support for these older version firesticks. I have a couple registered on Amazon, but don’t use them or not for Netflix. The letter:
" Dear customer,

We noticed you’ve used Netflix on a first-generation Fire TV streaming media player within the past year. As you might have seen, Netflix will discontinue support for these streaming media players starting June 2, 2025. This affects:

• Fire TV (1st Gen)
• Fire TV Stick (1st Gen)
• Fire TV Stick (1st Gen) with Voice

While your device will continue supporting other streaming services, we want to help ensure uninterrupted access to Netflix and enable you to experience new Fire TV features. As a valued customer, you’re eligible to upgrade to our latest Fire TV Stick 4K Max. Use code 50OFF4K for 50% off list price (applied at checkout).

Need assistance? Our support team is here to help 24/7, and you can easily manage your Content and Devices through your Amazon account.

Best regards,
The Fire TV Team