Use a modern PC to download YouTube videos as .mp4 files, then sync them to your old iPhone via iTunes (or a third-party tool like 3uTools). This bypasses the app entirely.
If you're looking to download YouTube 1.2.1 IPA for historical, educational, or personal reasons, here are some general steps. However, be aware that these steps may not be straightforward or recommended due to potential security concerns: Youtube 1.2.1 Ipa Download
The summer of 2010 felt small and electric. Smartphones were still learning to be indispensable; app stores were crowded bazaars of possibility. In that restless market, a modest .ipa file moved like contraband and lore: YouTube 1.2.1 — an iteration of an app that, for many, meant the first doorway to a new kind of media. Use a modern PC to download YouTube videos as