Help unlocking HTC M8 sprint

Help unlocking thid model!

Android OS: 4.4.4
Product Name: sprint_wwe_harman
Project Name: M8_WHL_K444_SENSE60_SPCS_MR:403246
Flash Memory: EMMC
Baseband: 1.08.20.0916
Firmware CID: SPCS_004
SerialNo: HT45GSF04923
Secure Status: S-ON
Root Status: OK!
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IMEI: 990004994089609
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Unlocking Phone…
Reading Phone Info…
Simlock Status: Unlocked!
Restarting Phone…
Operation Failed.

And phone remains locked. What can I do?
BR