HTC has started rolling out Android 4.2.2 update with Sense 5.0 to HTC One SV in select European markets. The update is currently live for 4G LTE units in at least Croatia & Norway but the 3G and other 4G versions should get the update in the coming weeks.
431MB in size, the update is being released over-the-air and will automatically reach your One SV LTE smartphone. You can also manually check for the update by going to Settings << About Phone << Software Update.
HTC has not revealed the full change-log and has just stated that the update includes important enhancements and bug-fixes. You can expect to see lock-screen widgets, notification shade quick settings and performance improvements on your phone after the update.

Hi
Is HTC provide OS updates for HTC Desire SV ?