The zImage and Modules are the kernel. That is what you DO need to update at minimum to fix the sound issue.
ALWAYS backup your data.img regardless of what build because not every build will work with the old settings.
backup your apps and things with Titanium Backup or similar app
Backup Data.img
Delete old build entirely except data.img
Put new build on
Double check startup.txt for keyboard map and other settings like turning ON Hardware 3d option
Boot.
If it fails to boot in 10 minutes or reboots to windows, delete your data.img and start from scratch. Reinstall your apps as the restoring them may break the settings your new data.img.
Restore at your own risk, not everything will restore.
Sent from my HTC Touch Pro 2 on Android with Tapatalk Pro.
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