diff --git a/app-common/src/main/java/im/angry/openeuicc/ui/wizard/DownloadWizardDetailsFragment.kt b/app-common/src/main/java/im/angry/openeuicc/ui/wizard/DownloadWizardDetailsFragment.kt
index 4f66307..cd758c3 100644
--- a/app-common/src/main/java/im/angry/openeuicc/ui/wizard/DownloadWizardDetailsFragment.kt
+++ b/app-common/src/main/java/im/angry/openeuicc/ui/wizard/DownloadWizardDetailsFragment.kt
@@ -78,13 +78,12 @@ class DownloadWizardDetailsFragment : DownloadWizardActivity.DownloadWizardStepF
     }
 
     private fun validate() {
-        smdp.error = smdp.editText!!.text?.let {
+        smdp.editText!!.error = smdp.editText!!.text?.let {
             if (Patterns.DOMAIN_NAME.matcher(smdp.editText!!.text).matches()) return@let null
             getString(R.string.download_wizard_error_invalid_address_format)
         }
-        imei.error = imei.editText!!.text?.let {
-            if (it.isEmpty()) return@let null
-            if (it.length == 15 && luhnValid(it)) return@let null
+        imei.editText!!.error = imei.editText!!.text?.let {
+            if (it.isEmpty() || luhnValid(it)) return@let null
             getString(R.string.download_wizard_error_invalid_imei_format)
         }
     }