苹果于今日凌晨推送了iOS8 beta4更新，此次测试版中苹果增加了“帮助”应用引导用户如何快速上手iOS8，而且还进行了多处细节界面的调整，包括控制中心及浏览器等部分。另外还修复了不少bug，不断完善用户体验。
该版本代码为12a4331d，适用于iPhone4s及以上设备。以下是同步推整理的全设备苹果官方iOS8 beta4下载地址，拥有开发者账号的用户可直接下载，没有开发者账号的用户建议将地址复制到迅雷上下载。请查看设备背面的型号标识，下载对应的固件。（注：同步推会尽快将固件下载地址整理到网盘，方便你更快下载）
---------------------------------------iOS8 beta4固件下载汇总---------------------------------------
iPhone 5S
iPhone 5S（model A1453，A1533）CDMA
https://adcdownload.apple.com//ios/ios_8_beta_4_ym8ro2/ios_8_beta_4__iphone_5s_model_a1453_a1533__12a4331d.zip
iPhone 5S（model A1457，A1518，A1526，A1529，A1530）GSM
https://adcdownload.apple.com//ios/ios_8_beta_4_ym8ro2/ios_8_beta_4__iphone_5s_model_a1457_a1518_a1528_a1530__12a4331d.zip
iPhone 5C
iPhone 5C（model A1456，A1532）GSM
https://adcdownload.apple.com//ios/ios_8_beta_4_ym8ro2/ios_8_beta_4__iphone_5c_model_a1456_a1532__12a4331d.zip
iPhone 5C（model A1507，A1516，A1526，A1529）CDMA
https://adcdownload.apple.com//ios/ios_8_beta_4_ym8ro2/ios_8_beta_4__iphone_5c_model_a1507_a1516_a1526_a1529__12a4331d.zip
iPhone 5
iPhone 5（model A1428）GSM
https://adcdownload.apple.com//ios/ios_8_beta_4_ym8ro2/ios_8_beta_4__iphone_5_model_a1428__12a4331d.zip
iPhone 5（model A1429）CDMA
https://adcdownload.apple.com//ios/ios_8_beta_4_ym8ro2/ios_8_beta_4__iphone_5_model_a1429__12a4331d.zip
iPhone 4S
https://adcdownload.apple.com//ios/ios_8_beta_4_ym8ro2/ios_8_beta_4__iphone_4s__12a4331d.zip
iPod touch 5
https://adcdownload.apple.com//ios/ios_8_beta_4_ym8ro2/ios_8_beta_4__ipod_touch_5th_generation__12a4331d.zip
iPad Air
iPad air（Model A1474）WIFI
https://adcdownload.apple.com//ios/ios_8_beta_4_ym8ro2/ios_8_beta_4__ipad_air_model_a1474__12a4331d.zip
iPad Air（model A1475）CDMA
https://adcdownload.apple.com//ios/ios_8_beta_4_ym8ro2/ios_8_beta_4__ipad_air_model_a1475__12a4331d.zip
iPad Air（model A1476）GSM
https://adcdownload.apple.com//ios/ios_8_beta_4_ym8ro2/ios_8_beta_4__ipad_air_model_a1476__12a4331d.zip
iPad mini Retina
iPadminiRetina（model A1489）WIFI
https://adcdownload.apple.com//ios/ios_8_beta_4_ym8ro2/ios_8_beta_4__ipad_mini_model_a1489__12a4331d.zip
iPad mini Retina（model A1490）CDMA
https://adcdownload.apple.com//ios/ios_8_beta_4_ym8ro2/ios_8_beta_4__ipad_mini_model_a1490__12a4331d.zip
iPad mini Retina（model A1491）GSM
https://adcdownload.apple.com//ios/ios_8_beta_4_ym8ro2/ios_8_beta_4__ipad_mini_model_a1491__12a4331d.zip
iPad 4
iPad 4（generation model A1458）WIFI
https://adcdownload.apple.com//ios/ios_8_beta_4_ym8ro2/ios_8_beta_4__ipad_4th_generation_model_a1458__12a4331d.zip
iPad 4（generation model A1459）GSM
https://adcdownload.apple.com//ios/ios_8_beta_4_ym8ro2/ios_8_beta_4__ipad_4th_generation_model_a1459__12a4331d.zip
iPad 4（generation model A1460）CDMA
https://adcdownload.apple.com//ios/ios_8_beta_4_ym8ro2/ios_8_beta_4__ipad_4th_generation_model_a1460__12a4331d.zip
iPad mini
iPad mini（model A1432）WIFI
https://adcdownload.apple.com//ios/ios_8_beta_4_ym8ro2/ios_8_beta_4__ipad_mini_model_a1432__12a4331d.zip
iPad mini（model A1454）GSM
https://adcdownload.apple.com//ios/ios_8_beta_4_ym8ro2/ios_8_beta_4__ipad_mini_model_a1454__12a4331d.zip
iPad mini（model A1455）CDMA
https://adcdownload.apple.com//ios/ios_8_beta_4_ym8ro2/ios_8_beta_4__ipad_mini_model_a1455__12a4331d.zip
iPad 3
iPad WiFi（3rd generation）WIFI
https://adcdownload.apple.com//ios/ios_8_beta_4_ym8ro2/ios_8_beta_4__ipad_wifi_3rd_generation__12a4331d.zip
iPad 3 WiFi+cellular（model for ATT）GSM
https://adcdownload.apple.com//ios/ios_8_beta_4_ym8ro2/ios_8_beta_4__ipad_wifi__cellular_model_for_att__12a4331d.zip
iPad 3 WiFi+cellular（model for Verizon）CDMA
https://adcdownload.apple.com//ios/ios_8_beta_4_ym8ro2/ios_8_beta_4__ipad_wifi__cellular_model_for_verizon__12a4331d.zip
iPad 2
iPad 2 WiFi（Rev_a 新制程版 )
https://adcdownload.apple.com//ios/ios_8_beta_4_ym8ro2/ios_8_beta_4__ipad_2_wifi_rev_a__12a4331d.zip
iPad 2 ( model A1395）WiFi
https://adcdownload.apple.com//ios/ios_8_beta_4_ym8ro2/ios_8_beta_4__ipad_2_wifi__12a4331d.zip
iPad 2 ( model A1396）WiFi+3G+GSM
https://adcdownload.apple.com//ios/ios_8_beta_4_ym8ro2/ios_8_beta_4__ipad_2_wifi__3g_gsm__12a4331d.zip
iPad 2（ model A1397）Wi-Fi+3G+GSM+CDMA
https://adcdownload.apple.com//ios/ios_8_beta_4_ym8ro2/ios_8_beta_4__ipad_2_wifi__3g_cdma__12a4331d.zip
iOS8 beta4详细图文升级教程，请参阅>>>如何升级iOS8 beta4（无需开发者账号）
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