One UI 7 rollout started slowly but peaked in the last few days. The update only arrived for the Galaxy A55 some hours ago, and now the Galaxy A35 One UI 7 stable update is available for download. It is a limited release exclusive to a few countries.

Samsung does not seem to be following its release schedule again with the phones that have received the One UI 7 update recently. The Galaxy A35 is not expected to be upgraded until later, but those in Korea can install the update. It is a limited release and might take a few days to arrive for all eligible phones.
Details of the Galaxy A35 One UI 7 stable update
Samsung is rolling out a stable One UI 7 build with firmware version A356NKSU4BYDD in South Korea for Galaxy A35 users. The update size is about 3.5GB. You probably need to connect to Wi-Fi before you start the upgrade.
As expected, Samsung has delivered new features, optimization, bug fixes, and a new security patch. We recommend installing the update when prompted as it brings some AI features as well. Unfortunately, many will be missing due to the resources available on the Galaxy A35.
We understand Samsung has limited the release to South Korea, but we expect an expansion to Europe and the US in the coming days. You can check for the upgrade via Settings>>System updates>>Download and install. Follow the screen prompts to complete the installation.