according this support.t-mobile.com/docs/DOC-7393 Fierce will got update via OTA This upsdate will provide fixes for 911 call failure issues and fix the issue with the device not powering on. but their document is totally weird: Software versions Android version 4.2.2 / Build number L2RUMR0 (Current) Version Android version 2.3.6 / Build number C85B845?????? Kernel version: 126.96.36.199????? Baseband: 404026 Released 2/25/2013?!????