diff --git a/libs/lpac-jni/src/main/jni/lpac-jni/lpac-download.c b/libs/lpac-jni/src/main/jni/lpac-jni/lpac-download.c
index 364c7c8..7753e15 100644
--- a/libs/lpac-jni/src/main/jni/lpac-jni/lpac-download.c
+++ b/libs/lpac-jni/src/main/jni/lpac-jni/lpac-download.c
@@ -60,14 +60,19 @@ void lpac_download_init() {
     set_cancelled = (*env)->GetMethodID(env, download_callback_class, "setCancelled", "(Z)V");
 }
 
-#define IS_CANCELLED (*env)->CallBooleanMethod(env, callback, is_cancelled) == JNI_TRUE
-#define SET_CANCELLED(VALUE) (*env)->CallVoidMethod(env, callback, set_cancelled, VALUE)
+#define IS_CANCELLED (*env)->CallBooleanMethod(env, callback, is_cancelled)
 
 JNIEXPORT jint JNICALL
-Java_net_typeblog_lpac_1jni_LpacJni_downloadProfile(JNIEnv *env, jobject thiz, jlong handle,
-                                                    jstring smdp, jstring matching_id,
-                                                    jstring imei, jstring confirmation_code,
-                                                    jobject callback) {
+Java_net_typeblog_lpac_1jni_LpacJni_downloadProfile(
+        JNIEnv *env,
+        __attribute__((unused)) jobject thiz,
+        jlong handle,
+        jstring smdp,
+        jstring matching_id,
+        jstring imei,
+        jstring confirmation_code,
+        jobject callback
+) {
     struct euicc_ctx *ctx = (struct euicc_ctx *) handle;
     struct es10b_load_bound_profile_package_result es10b_load_bound_profile_package_result;
     const char *_confirmation_code = NULL;
@@ -86,10 +91,11 @@ Java_net_typeblog_lpac_1jni_LpacJni_downloadProfile(JNIEnv *env, jobject thiz, j
 
     ctx->http.server_address = _smdp;
 
-    if (IS_CANCELLED) {
+    if (IS_CANCELLED) { // callback.isCancelled()
         ret = -ES10B_ERROR_REASON_UNDEFINED;
         goto out;
     }
+    // callback.onStateUpdate(DownloadState.Preparing)
     (*env)->CallVoidMethod(env, callback, on_state_update, download_state_preparing);
     ret = es10b_get_euicc_challenge_and_info(ctx);
     syslog(LOG_INFO, "es10b_get_euicc_challenge_and_info %d", ret);
@@ -98,10 +104,12 @@ Java_net_typeblog_lpac_1jni_LpacJni_downloadProfile(JNIEnv *env, jobject thiz, j
         goto out;
     }
 
-    if (IS_CANCELLED) {
+
+    if (IS_CANCELLED) { // callback.isCancelled()
         ret = -ES10B_ERROR_REASON_UNDEFINED;
         goto out;
     }
+    // callback.onStateUpdate(DownloadState.Connecting)
     (*env)->CallVoidMethod(env, callback, on_state_update, download_state_connecting);
     ret = es9p_initiate_authentication(ctx);
     syslog(LOG_INFO, "es9p_initiate_authentication %d", ret);
@@ -110,10 +118,11 @@ Java_net_typeblog_lpac_1jni_LpacJni_downloadProfile(JNIEnv *env, jobject thiz, j
         goto out;
     }
 
-    if (IS_CANCELLED) {
+    if (IS_CANCELLED) { // callback.isCancelled()
         ret = -ES10B_ERROR_REASON_UNDEFINED;
         goto out;
     }
+    // callback.onStateUpdate(DownloadState.Authenticating)
     (*env)->CallVoidMethod(env, callback, on_state_update, download_state_authenticating);
     ret = es10b_authenticate_server(ctx, _matching_id, _imei);
     syslog(LOG_INFO, "es10b_authenticate_server %d", ret);
@@ -122,7 +131,7 @@ Java_net_typeblog_lpac_1jni_LpacJni_downloadProfile(JNIEnv *env, jobject thiz, j
         goto out;
     }
 
-    if (IS_CANCELLED) {
+    if (IS_CANCELLED) { // callback.isCancelled()
         ret = -ES10B_ERROR_REASON_UNDEFINED;
         goto out;
     }
@@ -133,10 +142,11 @@ Java_net_typeblog_lpac_1jni_LpacJni_downloadProfile(JNIEnv *env, jobject thiz, j
         goto out;
     }
 
-    if (IS_CANCELLED) {
+    if (IS_CANCELLED) { // callback.isCancelled()
         ret = -ES10B_ERROR_REASON_UNDEFINED;
         goto out;
     }
+    // callback.onStateUpdate(DownloadState.Downloading)
     (*env)->CallVoidMethod(env, callback, on_state_update, download_state_downloading);
     ret = es10b_prepare_download(ctx, _confirmation_code);
     syslog(LOG_INFO, "es10b_prepare_download %d", ret);
@@ -145,7 +155,7 @@ Java_net_typeblog_lpac_1jni_LpacJni_downloadProfile(JNIEnv *env, jobject thiz, j
         goto out;
     }
 
-    if (IS_CANCELLED) {
+    if (IS_CANCELLED) { // callback.isCancelled()
         ret = -ES10B_ERROR_REASON_UNDEFINED;
         goto out;
     }
@@ -154,10 +164,11 @@ Java_net_typeblog_lpac_1jni_LpacJni_downloadProfile(JNIEnv *env, jobject thiz, j
     if (ret < 0)
         goto out;
 
-    if (IS_CANCELLED) {
+    if (IS_CANCELLED) { // callback.isCancelled()
         ret = -ES10B_ERROR_REASON_UNDEFINED;
         goto out;
     }
+    // callback.onStateUpdate(DownloadState.Finalizing)
     (*env)->CallVoidMethod(env, callback, on_state_update, download_state_finalizing);
     ret = es10b_load_bound_profile_package(ctx, &es10b_load_bound_profile_package_result);
     syslog(LOG_INFO, "es10b_load_bound_profile_package %d, reason %d", ret, es10b_load_bound_profile_package_result.errorReason);
@@ -170,7 +181,7 @@ Java_net_typeblog_lpac_1jni_LpacJni_downloadProfile(JNIEnv *env, jobject thiz, j
 
     out:
     if (IS_CANCELLED == 0 && ret == -ES10B_ERROR_REASON_UNDEFINED) {
-        SET_CANCELLED(JNI_TRUE);
+        (*env)->CallVoidMethod(env, callback, set_cancelled, JNI_TRUE);
     }
     // We expect Java side to call cancelSessions after any error -- thus, `euicc_http_cleanup` is done there
     // This is so that Java side can access the last HTTP and/or APDU errors when we return.