diff --git a/fido2/ctaphid.c b/fido2/ctaphid.c
index e815dd65..f051d828 100644
--- a/fido2/ctaphid.c
+++ b/fido2/ctaphid.c
@@ -542,6 +542,9 @@ extern void _check_ret(CborError ret, int line, const char * filename);
 
 uint8_t ctaphid_custom_command(int len, CTAP_RESPONSE * ctap_resp, CTAPHID_WRITE_BUFFER * wb);
 
+
+extern void solo_lock_if_not_already();
+
 uint8_t ctaphid_handle_packet(uint8_t * pkt_raw)
 {
     uint8_t cmd = 0;
@@ -762,6 +765,16 @@ uint8_t ctaphid_custom_command(int len, CTAP_RESPONSE * ctap_resp, CTAPHID_WRITE
             return 1;
         break;
 
+        // Remove on next release
+#if !defined(IS_BOOTLOADER) && defined(SOLO)
+        case 0x99:
+            solo_lock_if_not_already();
+            wb->bcnt = 0;
+            ctaphid_write(wb, NULL, 0);
+            return 1;
+        break;
+#endif
+
 #if !defined(IS_BOOTLOADER) && (defined(SOLO_EXPERIMENTAL))
         case CTAPHID_LOADKEY:
             /**
diff --git a/targets/stm32l432/src/device.c b/targets/stm32l432/src/device.c
index 1a83ebc5..b04a640f 100644
--- a/targets/stm32l432/src/device.c
+++ b/targets/stm32l432/src/device.c
@@ -199,6 +199,20 @@ int solo_is_locked(){
     return tag == ATTESTATION_CONFIGURED_TAG && (device_settings & SOLO_FLAG_LOCKED) != 0;
 }
 
+// Locks solo flash from debugging.  Locks on next reboot.
+// This should be removed in next Solo release.
+void solo_lock_if_not_already() {
+    uint8_t buf[2048];
+
+    memmove(buf, (uint8_t*)ATTESTATION_PAGE_ADDR, 2048);
+
+    ((flash_attestation_page *)buf)->device_settings |= SOLO_FLAG_LOCKED;
+
+    flash_erase_page(ATTESTATION_PAGE);
+
+    flash_write(ATTESTATION_PAGE_ADDR, buf, 2048);
+}
+
 /** device_migrate
  * Depending on version of device, migrates:
  * * Moves attestation certificate to data segment.