Dictionary port - #30
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Recovery features backported onto the v1.8.3 base (current master is buggy). SD Card Firmware Update (Settings -> System): validate and flash any .bin from the SD card via raw esp_partition write + direct otadata switch, deliberately bypassing esp_image_verify so USB-locked (eFuse-burned) X3/X4 units can re-flash to any firmware (CrossPoint / CrossInk / stock) with no USB and no network. Verified on X4 hardware. OTA memory-pressure fix: free the active reader/UI font caches before the update-check and firmware-download TLS handshakes, restoring them afterwards. On the ESP32-C3 (~46KB free after WiFi) a loaded external CJK font otherwise leaves too little heap for the mbedTLS handshake, so OTA aborted before the ClientHello. Backports FontManager::unloadActiveFonts/reloadActiveFonts. Addresses trilwu#28.
SD Card Firmware Update + OTA memory-pressure fix, with the escape steps for stuck 1.8.3 devices. Addresses trilwu#28.
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