diff --git a/firmware/main/c6_ota.c b/firmware/main/c6_ota.c
index 983a09d..a3aed37 100644
--- a/firmware/main/c6_ota.c
+++ b/firmware/main/c6_ota.c
@@ -44,8 +44,8 @@ static void c6_ota_task(void *arg)
     vTaskDelay(pdMS_TO_TICKS(8000)); /* let the hosted transport settle */
     esp_hosted_coprocessor_fwver_t v = { 0 };
     if (esp_hosted_get_coprocessor_fwversion(&v) == ESP_OK &&
-        v.major1 >= 2) {
-        ESP_LOGI(TAG, "C6 fw already 2.x — no OTA needed");
+        v.major1 == 2 && v.minor1 == 12 && v.patch1 == 12) {
+        ESP_LOGI(TAG, "C6 fw already 2.12.12-btfree — no OTA needed");
         vTaskDelete(NULL);
         return;
     }
diff --git a/firmware/main/c6_slave.bin b/firmware/main/c6_slave.bin
index a606cf1..d7dc3f2 100644
Binary files a/firmware/main/c6_slave.bin and b/firmware/main/c6_slave.bin differ