The “hot” nature of version 3.74 suggests this might be the for the PS Vita. Sony’s lifecycle policy for legacy consoles usually ends with a critical security patch, followed by a “sunset” period.
Do not turn off the power during the “Updating database” phase (usually stuck at 58% for 90 seconds). This is the hotfix patching the kernel. Interrupting this will lead to a soft brick requiring a recovery menu restore. ps vita system software update 374 hot
You can no longer create a new PSN account directly on the Vita or PS TV console. Reduced Account Management: The “hot” nature of version 3