From 55916f31aad66689716b1b03ebaaef4f0e8d507e Mon Sep 17 00:00:00 2001
From: Cody Henthorne <cody@signal.org>
Date: Wed, 15 Oct 2025 15:43:59 -0400
Subject: [PATCH] Only consider backup5 for link and sync.

---
 .../thoughtcrime/securesms/linkdevice/LinkDeviceViewModel.kt    | 2 +-
 .../signalservice/api/provisioning/ProvisioningSocket.kt        | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/app/src/main/java/org/thoughtcrime/securesms/linkdevice/LinkDeviceViewModel.kt b/app/src/main/java/org/thoughtcrime/securesms/linkdevice/LinkDeviceViewModel.kt
index 8cbe37c930..f4fd80d558 100644
--- a/app/src/main/java/org/thoughtcrime/securesms/linkdevice/LinkDeviceViewModel.kt
+++ b/app/src/main/java/org/thoughtcrime/securesms/linkdevice/LinkDeviceViewModel.kt
@@ -424,7 +424,7 @@ class LinkDeviceViewModel : ViewModel() {
 
   private fun Uri.supportsLinkAndSync(): Boolean {
     val capabilities = this.getQueryParameter("capabilities")?.split(",")?.toSet() ?: emptySet()
-    return "backup4" in capabilities || "backup5" in capabilities
+    return "backup5" in capabilities
   }
 
   fun onSyncErrorIgnored() = viewModelScope.launch(Dispatchers.IO) {
diff --git a/libsignal-service/src/main/java/org/whispersystems/signalservice/api/provisioning/ProvisioningSocket.kt b/libsignal-service/src/main/java/org/whispersystems/signalservice/api/provisioning/ProvisioningSocket.kt
index be67a119ff..00c0ab724f 100644
--- a/libsignal-service/src/main/java/org/whispersystems/signalservice/api/provisioning/ProvisioningSocket.kt
+++ b/libsignal-service/src/main/java/org/whispersystems/signalservice/api/provisioning/ProvisioningSocket.kt
@@ -290,7 +290,7 @@ class ProvisioningSocket<T> private constructor(
 
   enum class Mode(val host: String, val params: String) {
     REREG("rereg", ""),
-    LINK("linkdevice", "&capabilities=backup4")
+    LINK("linkdevice", "&capabilities=backup5")
   }
 
   fun interface ProvisioningSocketExceptionHandler {