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The following steps detail how to reprogram the firmware from an external USB stick for Sentinels with a serial number greater than 300000.
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Create a folder called rrrecoverydir on a USB stick formatted to FAT32. Download the latest Sentinel firmware from https://calnexsol.flexnetoperations.com/flexnet/operationsportal/ and unpack the sentinel_fw_Rx.x.x.tar file. As an example the contents of the sentinel_fw_R15.0.0.tar file are shown.  Image ModifiedUnpack the sentinel_fw_v2.15.0.0.6698-20211208.tar archive  Image Removed Image AddedInsert the USB stick into the Sentinel unit and power up. The firmware will be restored and the Sentinel should boot.
NOTE: The process may prompt to update the firmware on the PTP cards. Remove the USB stick before re-boot to prevent the recovery process from starting over again. It is also advisable to delete the rrrecoverydir directory from the USB stick.
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