diff --git a/firmware/code/configuration_manager.c b/firmware/code/configuration_manager.c
index 0a3e7e1..d591168 100644
--- a/firmware/code/configuration_manager.c
+++ b/firmware/code/configuration_manager.c
@@ -148,6 +148,7 @@ void apply_filter_configuration(filter_configuration_tlv *filters) {
         // so try to preserve our remembered values.
         // If a filter type changes, we do a memory reset.
         static uint8_t bqf_filter_types[MAX_FILTER_STAGES] = { };
+        static uint32_t bqf_filter_checksum[MAX_FILTER_STAGES] = { };
         if (type != bqf_filter_types[filter_stages]) {
             bqf_filter_types[filter_stages] = type;
             type_changed = true;
@@ -502,19 +503,8 @@ void config_in_packet(struct usb_endpoint *ep) {
     usb_packet_done(ep);
 }
 
-void configuration_ep_on_stall_change(struct usb_endpoint *ep) {
-    printf("Config EP stall change: %d\n", usb_is_endpoint_stalled(ep));
-    if (!usb_is_endpoint_stalled(ep)) {
-        write_offset = 0;
-        tlv_header* request = ((tlv_header*) working_configuration[inactive_working_configuration]);
-        request->type = NOK;
-        request->length = 0;
-    }
-}
-
 void configuration_ep_on_cancel(struct usb_endpoint *ep) {
-    printf("Config EP on cancel\n");
-
+    printf("Cancel request on config EP\n");
     write_offset = 0;
     tlv_header* request = ((tlv_header*) working_configuration[inactive_working_configuration]);
     request->type = NOK;
@@ -523,11 +513,9 @@ void configuration_ep_on_cancel(struct usb_endpoint *ep) {
 
 void apply_config_changes() {
     if (reload_config) {
-        //uint32_t ints = save_and_disable_interrupts();
         reload_config = false;
         const uint8_t active_configuration = inactive_working_configuration ? 0 : 1;
         apply_configuration((tlv_header*) working_configuration[active_configuration]);
-        //restore_interrupts(ints);
     }
 }
 #endif
\ No newline at end of file
diff --git a/firmware/code/configuration_manager.h b/firmware/code/configuration_manager.h
index 70e32d5..2ff115c 100644
--- a/firmware/code/configuration_manager.h
+++ b/firmware/code/configuration_manager.h
@@ -24,16 +24,26 @@ struct usb_endpoint;
 
 #define INIT_FILTER2(T) { \
     filter2 *args = (filter2 *)ptr; \
-    bqf_##T##_config(SAMPLING_FREQ, args->f0, args->Q, &bqf_filters_left[filter_stages]); \
-    memcpy(&bqf_filters_right[filter_stages], &bqf_filters_left[filter_stages], sizeof(bqf_coeff_t)); \
+    uint32_t checksum = 0; \
+    for (int i = 0; i < sizeof(filter2) / 4; i++) checksum ^= ((uint32_t*) args)[i]; \
+    if (checksum != bqf_filter_checksum[filter_stages]) { \
+        bqf_##T##_config(SAMPLING_FREQ, args->f0, args->Q, &bqf_filters_left[filter_stages]); \
+        memcpy(&bqf_filters_right[filter_stages], &bqf_filters_left[filter_stages], sizeof(bqf_coeff_t)); \
+        bqf_filter_checksum[filter_stages] = checksum; \
+    } \
     ptr += sizeof(filter2); \
     break; \
     }
 
 #define INIT_FILTER3(T) { \
     filter3 *args = (filter3 *)ptr; \
-    bqf_##T##_config(SAMPLING_FREQ, args->f0, args->db_gain, args->Q, &bqf_filters_left[filter_stages]); \
-    memcpy(&bqf_filters_right[filter_stages], &bqf_filters_left[filter_stages], sizeof(bqf_coeff_t)); \
+    uint32_t checksum = 0; \
+    for (int i = 0; i < sizeof(filter3) / 4; i++) checksum ^= ((uint32_t*) args)[i]; \
+    if (checksum != bqf_filter_checksum[filter_stages]) { \
+        bqf_##T##_config(SAMPLING_FREQ, args->f0, args->db_gain, args->Q, &bqf_filters_left[filter_stages]); \
+        memcpy(&bqf_filters_right[filter_stages], &bqf_filters_left[filter_stages], sizeof(bqf_coeff_t)); \
+        bqf_filter_checksum[filter_stages] = checksum; \
+    } \
     ptr += sizeof(filter3); \
     break; \
     }