diff --git a/libfprint/drivers/elan.h b/libfprint/drivers/elan.h
index c2f9a66..0aac905 100644
--- a/libfprint/drivers/elan.h
+++ b/libfprint/drivers/elan.h
@@ -39,12 +39,15 @@
 #define ELAN_MIN_CALIBRATION_FW 0x0138
 
 /* max difference between background image mean and calibration mean
- * (the response value of get_calib_mean_cmd)*/
-#define ELAN_CALIBRATION_MAX_DELTA 500
+ * (the response value of get_calib_mean_cmd).
+ * Set very high to skip active recalibration — background is always
+ * re-captured at activation, and the recalibration handshake is
+ * unreliable on some devices (e.g. 04f3:0c6e). */
+#define ELAN_CALIBRATION_MAX_DELTA 65535
 
 /* times to retry reading calibration status during one session
  * generally prevents calibration from looping indefinitely */
-#define ELAN_CALIBRATION_ATTEMPTS 30
+#define ELAN_CALIBRATION_ATTEMPTS 100
 
 /* min and max frames in a capture */
 #define ELAN_MIN_FRAMES 1