[Honor 7X  Guides, News, & Discussion] topnomi:
Here is everything around that line:

03-21 16:22:43.292 5232 5287 I HwOUC : [Download Service-71]isMeteredWifi is false(hwouc/HwOucUtility.java:3981)
03-21 16:22:43.292 5232 5287 I HwOUC : [Download Service-71]isAutoDownloadAllowedUnderWifi wifiType is 2(hwouc/HwOucUtility.java:3992)
03-21 16:22:43.293 5232 5287 I HwOUC : [Download Service-71]isAutoDownloadAllowedUnderWifi not hot point wifi, continue download(hwouc/HwOucUtility.java:3997)
03-21 16:22:43.295 5232 5287 I HwOUC : [Download Service-71]UpdateThread-- run, id = 4 arrayId = 4, updateDownload(hwouc/DownloadService.java:704)
03-21 16:22:43.296 5232 5287 I HwOUC : [Download Service-71]DownloadService-- updateDownload(hwouc/DownloadService.java:1113)
03-21 16:22:43.296 414 417 E teecd : cannot find package:system_server
03-21 16:22:43.296 414 417 E teecd : get certs for app failed
03-21 16:22:43.296 5232 5287 I HwOUC : [Download Service-71]isReadyToRestart mControl is 0;mStatus is 192;mNumFailed is 0(hwouc/DownloadInfo.java:197)
03-21 16:22:43.296 5232 5287 I HwOUC : [Download Service-71]DownloadService-- updateDownload, not ready to restart(hwouc/DownloadService.java:1255)
03-21 16:22:43.296 5232 5287 I HwOUC : [Download Service-71]updateActiveNotification auto download mode, do not show progress and notification(hwouc/DownloadNotification.java:167)
03-21 16:22:43.297 5232 5290 I HwOUC : [Thread-7-74]DownloadThread-- run, new length is 369620573(hwouc/DownloadThread.java:318)
03-21 16:22:43.298 5232 5287 I HwOUC : [Download Service-71]UpdateThread-- run synchronized(MUTEX) isUpdateThreadNeedToRun false return(hwouc/DownloadService.java:402)
03-21 16:22:43.314 5232 5290 I HwOUC : [Thread-7-74]DownloadThread-- run, byteSoFar = 369620573 totalSize = 1835957514(hwouc/DownloadThread.java:368)
03-21 16:22:43.314 5232 5290 I HwOUC : [Thread-7-74]DownloadThread-- run, download url is https://updatebeta.hicloud.com/TDS/data/F2904FDA6DDC23269AA107EE162B6B5586E1A0396E21E766093407FCCE628382/1521749733/files/p3/s15/G2650/g1699/v120640/f1/full/update.zip(hwouc/DownloadThread.java:380)
03-21 16:22:43.314 5232 5290 I HwOUC : [Thread-7-74]isBetaReleasedVersion uri is https://updatebeta.hicloud.com/TDS/data/F2904FDA6DDC23269AA107EE162B6B5586E1A0396E21E766093407FCCE628382/1521749733/files/p3/s15/G2650/g1699/v120640/f1/full/update.zip(hwouc/HwOucUtility.java:6959)
03-21 16:22:43.314 5232 5290 I HwOUC : [Thread-7-74]isBetaReleasedVersion uri contains v120640/; return true(hwouc/HwOucUtility.java:6976)
03-21 16:22:43.314 5232 5290 I HwOUC : [Thread-7-74]DownloadThread-- run, isBetaReleasedVersion is true(hwouc/DownloadThread.java:387)
03-21 16:22:43.320 5232 5290 I HwOUC : [Thread-7-74]isWifiOnly isVoiceCapable is true; isSmsCapable is true; isWifiOnly is false(hwouc/HwOucUtility.java:1759)
03-21 16:22:43.321 5232 5290 I HwOUC : [Thread-7-74]HwOucUtility.isWifiOnly = false(hwouc/HwOucUtility.java:2057)
03-21 16:22:43.321 5232 5290 I HwOUC : [Thread-7-74]tryCount = 1(hwouc/HwOucUtility.java:2063)

I don't think there is info to be deciphered, but here it is anyway. Unfortunately, i ****ed up running the command, and don't have the first entry, when it first found the update. I've only got these lines from during the update.

I think you are correct. it seems they're locking down access by providing unique URLs.

I don't understand why though... limiting access to the proper files just encourages people to try using the improper ones and bricking their devies...