# The same AT+RMTXPOWER commands work sometimes but not others **URL:** \ **Category:** Legacy HL Series\ **Created:** [March 3, 2020, 6:44pm UTC](https://forum.sierrawireless.com/t/the-same-at-rmtxpower-commands-work-sometimes-but-not-others/19601 "2020-03-03T18:44:53Z")\ **Posts on this page:** 1\ **Showing post:** 10
**Author:** ![david.king](https://avatars.discourse-cdn.com/v4/letter/d/96bed5/32.png) [@david.king](https://forum.sierrawireless.com/u/david.king)\ **Post date:** [March 10, 2020, 8:23am UTC](https://forum.sierrawireless.com/t/the-same-at-rmtxpower-commands-work-sometimes-but-not-others/19601/10 "2020-03-10T08:23:49Z")
Hi Vianney, Hmmm, OTA upgrade wouldn’t be an option for us on our production lines, as it would geographically constrain production to areas of the world where there is HL7692 Cellular network coverage. In any case production line OTA upgrade would take too long and be of variable duration dependant on Cellular network conditions. The HL7692 itself would seem to support firmware upgrade via UART as well as USB (see **+BOOTDWLCFG** command within _AirPrime\_HL76xx\_AT\_Commands\_Interface\_Guide\_Rev13\_0.pdf_) Might it be possible for Sierra to consider revising the `HL769x.2.27.183100.201809071813.x7120m_3_signed_exe.exe` installer, to support also upgrade via UART ? Perhaps Sierra could use the source code for `HL7800.4.3.9.0_EXE` as basis, because as mentioned, that supports upgrade via UART as well as USB. There’s no big hurry to add HL7692 firmware upgrade via UART to the `HL769x.2.27.183100.201809071813.x7120m_3_signed_exe.exe` installer. But if we know you have that scheduled to be available within say, 2 months, we can plan accordingly. The design of our daughterboard PCB that uses the HL7692, implements only UART connectivity. Adding in USB connectivity, from daughterboard to motherboard MCU, would be a major upheaval at this stage, and set back the product by several months. We were unaware that HL7692 firmware installer .exe’s were limited to USB. Best regards, David --- _[View the full topic](https://forum.sierrawireless.com/t/the-same-at-rmtxpower-commands-work-sometimes-but-not-others/19601)._