Fix 500 error since I don't know what length the ECID field should be for a newer device with a longer ECID:
POST https://p54-fmip.icloud.com/fmipservice/findme/10973066090/61dd7b522bb9d7cf78008dd4ae502b634b93e970/identityV3 HTTP/1.1 Accept-Language: en-us X-Apple-PrsId: 10973066090 X-Apple-I-MD: AAAABQAAABAwJtGKFyRP2hfjnWHeF6u4AAAAAw== X-Apple-I-MD-M: q89pkBhz0ArKwC5hqosqZlVI3OtHK8ZkB0lXvnixV5ksspqjyq4fw2IPQitzBP+9KUNJ7YGMnPeItnqG X-Apple-I-Client-Time: 2017-04-06T22:00:38Z Accept: / Content-Type: application/json X-Apple-Find-API-Ver: 6.0 X-Apple-AL-ID: EA1058C0-31C8-48D9-89C9-238FF1BF40C1 X-Apple-I-MD-RINFO: 17106176 Cookie: NSC_q54-gnjqtfswjdf=3af6a3c879369530b4d6e7863a58f4836f2bb7611b7d0ba6c6775cfda4feca351767fecb Authorization: Basic MTA5NzMwNjYwOTA6QVFBQUFBQlk1cm5Sb0NDV0VDa2s2c1YybUkzVHkxdHBZLW1xLXdFfg== X-Apple-Realm-Support: 1.0 User-Agent: FMDClient/6.0 iPhone8,2/13E238 Content-length: 482 Host: p54-fmip.icloud.com Accept-Encoding: gzip, deflate
==== COOKIE ==== NSC_q54-gnjqtfswjdf 3af6a3c879369530b4d6e7863a58f4836f2bb7611b7d0ba6c6775cfda4feca351767fecb
==== BASIC AUTH ==== 10973066090:AQAAAABY5rnRoCCWECkk6sV2mI3Ty1tpY-mq-wE~
==== REQUEST BODY ==== { "ecid": "0x32040bec26", "wifiMac": "68:db:ca:97:76:00", "serialNumber": "F2PQLYPWGRX5", "deviceInfo": { "udid": "61dd7b522bb9d7cf78008dd4ae502b634b93e970", "aps-token": "90bbd89e27d207c418cba08f67befb77a8948e3f7e2c6203a45dc585f2c7be67", "deviceColor": "#e4e7e8", "deviceClass": "iPhone", "enclosureColor": "#e4c1b9" }, "meid": "35329007643341", "btMac": "68:db:ca:97:76:01", "imei": "353290076433416", "deviceContext": { "deviceTS": "2017-04-06T22:00:38.551Z" }, "dsid": "10973066090" }
HTTP/1.1 500 Internal Server Error Server: AppleHttpServer/1dad28f Date: Thu, 06 Apr 2017 22:00:39 GMT Content-Type: application/json;charset=UTF-8 X-Responding-Instance: fmipservice:35400302:mr90p54ic-zteg03173101:8002:17B115:3150bfb X-Responding-Server: mr90p54ic-zteg03173101_002 X-Responding-Partition: p54 X-Apple-Retry-After: 0 Strict-Transport-Security: max-age=31536000; includeSubDomains via: icloudedge:ho11p00ic-ztde011318:7401:17B51:Houston X-Apple-Request-UUID: 07911e6c-4541-46e7-bf1b-1a3972fef917 access-control-expose-headers: X-Apple-Request-UUID access-control-expose-headers: Via Content-Length: 0
Example from my iPhone 6s Plus: UniqueChipID 3404706751931322
0xc1890108363ba = 3404706751931322
POST https://p15-fmip.icloud.com/fmipservice/findme/280584859/87cda23a7230769ef6aa1ded8a99a5d3e65b9d42/identityV3 X-Mme-Sign2: AwTROoclOcMFgmjEDjDTLqgPQWYKMKiZelSx5oZho64/qyqOPc5rkwLBc1L9eszlzMGx+2KMipL0npqDYVOwx/IAidyy Cookie: NSC_q15-gnjqtfswjdf=ffffffff12ac5ed045525d5f4f58455e445a4a422d6b X-Apple-PrsId: 280584859 X-Mme-Sign1: vcPfSIR8rbojEQjfdy7omw== X-Apple-Realm-Support: 1.0 X-Apple-I-Client-Time: 2017-02-03T18:55:17Z X-Apple-Find-API-Ver: 6.0 Authorization: Basic MjgwNTg0ODU5OkFRQUFBQUJZbE5HODB6Y2dtcnJpNUR1c2NtUW95c1drTTZXT0dsRX4= Accept-Language: en-us X-Apple-I-MD-RINFO: 17106176 Accept: / Content-Type: application/json X-Apple-AL-ID: 2A4BFD38-994F-4DA5-B3A3-A67E69ECE9F5 X-Apple-I-MD-M: 7uFG2/ZgB6SmF5r93yaqedoq+rugYFfglwmtO8rZlzO2ICtyDYMjk28WsJ7Ao7BMiPcwfupM8nF8zW87 X-Apple-I-MD: AAAABQAAABDD4s6at1JUOiIYqphz47gWAAAAAw== User-Agent: FMDClient/6.0 iPhone8,2/14C92 Content-length: 594 Host: p15-fmip.icloud.com Accept-Encoding: gzip, deflate { "serialNumber":"F2LS47Z9HFM2", "chipId":"0x8003", "dsid":"280584859", "imei":"355735074445968", "wifiMac":"90:b0:ed:7a:0e:03", "deviceContext":{ "deviceTS":"2017-02-03T18:55:10.015Z" }, "btMac":"90:b0:ed:7a:0e:04", "ecid":"0xc1890108363ba", "meid":"35573507444596", "deviceInfo":{ "aps-token":"E13FE0FBAA3E3E0DF21D772DD34846A662A9F0E4E63D5306671D31D4F6C838BD", "collectionStatus":"Complete-MA", "alCapability":3, "udid":"87cda23a7230769ef6aa1ded8a99a5d3e65b9d42" }, "ifcReceipt":"A4NBPICAP8xBx5WkQDULRHpEi7pXMq16DvnriLqZtO8hGe1cQCndZEusy554KxpcSkYjbwHyggYssopnQUsCeien0GhDkglBWDrl92Plpp7Po+MGO2CmxQZvhxc9erP5" }