Download iOS 15.4.1 (19E258) for iPhone 6s

You will have to note that you can only restore signed IPSW firmware files using iTunes or 3utools.

❌ This IPSW firmware is not being Signed by Apple

Firmware Identifier iPhone8,1
iOS Version 15.4.1
Release Date 2022-03-31
Update Date 2022-03-28
Sha1sum
58dbb3393dd8fc22289b43e92637bc885ab40153
Sha256sum
a800a0806a88fb49dfe49cd0ce8ca28430129963991e5e90a36c2fd82cdb1ebb
md5sum
08c0c84f30b95fdf567c7dedc78cf990
Size 4.89 GB
FileName
iPhone_4.7_15.4.1_19E258_Restore.ipsw
Status

Download IPSW (4.89GB) Check device info
Release Notes

It should be noted that these are the official release notes for the from Apple

This update includes the following bug fixes for your iPhone:

For information on the security content of Apple software updates, please visit this website:

https://support.apple.com/kb/HT201222